654 lines
21 KiB
C
654 lines
21 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2015 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../SDL_internal.h"
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/*
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Code to load and save surfaces in Windows BMP format.
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Why support BMP format? Well, it's a native format for Windows, and
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most image processing programs can read and write it. It would be nice
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to be able to have at least one image format that we can natively load
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and save, and since PNG is so complex that it would bloat the library,
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BMP is a good alternative.
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This code currently supports Win32 DIBs in uncompressed 8 and 24 bpp.
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*/
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#include "SDL_video.h"
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#include "SDL_assert.h"
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#include "SDL_endian.h"
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#include "SDL_pixels_c.h"
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#define SAVE_32BIT_BMP
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/* Compression encodings for BMP files */
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#ifndef BI_RGB
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#define BI_RGB 0
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#define BI_RLE8 1
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#define BI_RLE4 2
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#define BI_BITFIELDS 3
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#endif
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static void CorrectAlphaChannel(SDL_Surface *surface)
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{
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/* Check to see if there is any alpha channel data */
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SDL_bool hasAlpha = SDL_FALSE;
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#if SDL_BYTEORDER == SDL_BIG_ENDIAN
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int alphaChannelOffset = 0;
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#else
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int alphaChannelOffset = 3;
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#endif
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Uint8 *alpha = ((Uint8*)surface->pixels) + alphaChannelOffset;
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Uint8 *end = alpha + surface->h * surface->pitch;
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while (alpha < end) {
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if (*alpha != 0) {
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hasAlpha = SDL_TRUE;
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break;
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}
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alpha += 4;
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}
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if (!hasAlpha) {
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alpha = ((Uint8*)surface->pixels) + alphaChannelOffset;
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while (alpha < end) {
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*alpha = SDL_ALPHA_OPAQUE;
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alpha += 4;
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}
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}
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}
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SDL_Surface *
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SDL_LoadBMP_RW(SDL_RWops * src, int freesrc)
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{
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SDL_bool was_error;
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Sint64 fp_offset = 0;
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int bmpPitch;
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int i, pad;
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SDL_Surface *surface;
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Uint32 Rmask = 0;
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Uint32 Gmask = 0;
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Uint32 Bmask = 0;
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Uint32 Amask = 0;
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SDL_Palette *palette;
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Uint8 *bits;
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Uint8 *top, *end;
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SDL_bool topDown;
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int ExpandBMP;
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SDL_bool haveRGBMasks = SDL_FALSE;
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SDL_bool haveAlphaMask = SDL_FALSE;
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SDL_bool correctAlpha = SDL_FALSE;
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/* The Win32 BMP file header (14 bytes) */
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char magic[2];
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/* Uint32 bfSize = 0; */
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/* Uint16 bfReserved1 = 0; */
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/* Uint16 bfReserved2 = 0; */
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Uint32 bfOffBits = 0;
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/* The Win32 BITMAPINFOHEADER struct (40 bytes) */
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Uint32 biSize = 0;
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Sint32 biWidth = 0;
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Sint32 biHeight = 0;
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/* Uint16 biPlanes = 0; */
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Uint16 biBitCount = 0;
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Uint32 biCompression = 0;
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/* Uint32 biSizeImage = 0; */
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/* Sint32 biXPelsPerMeter = 0; */
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/* Sint32 biYPelsPerMeter = 0; */
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Uint32 biClrUsed = 0;
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/* Uint32 biClrImportant = 0; */
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/* Make sure we are passed a valid data source */
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surface = NULL;
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was_error = SDL_FALSE;
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if (src == NULL) {
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was_error = SDL_TRUE;
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goto done;
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}
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/* Read in the BMP file header */
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fp_offset = SDL_RWtell(src);
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SDL_ClearError();
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if (SDL_RWread(src, magic, 1, 2) != 2) {
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SDL_Error(SDL_EFREAD);
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was_error = SDL_TRUE;
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goto done;
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}
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if (SDL_strncmp(magic, "BM", 2) != 0) {
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SDL_SetError("File is not a Windows BMP file");
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was_error = SDL_TRUE;
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goto done;
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}
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/* bfSize = */ SDL_ReadLE32(src);
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/* bfReserved1 = */ SDL_ReadLE16(src);
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/* bfReserved2 = */ SDL_ReadLE16(src);
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bfOffBits = SDL_ReadLE32(src);
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/* Read the Win32 BITMAPINFOHEADER */
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biSize = SDL_ReadLE32(src);
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if (biSize == 12) { /* really old BITMAPCOREHEADER */
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biWidth = (Uint32) SDL_ReadLE16(src);
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biHeight = (Uint32) SDL_ReadLE16(src);
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/* biPlanes = */ SDL_ReadLE16(src);
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biBitCount = SDL_ReadLE16(src);
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biCompression = BI_RGB;
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} else if (biSize >= 40) { /* some version of BITMAPINFOHEADER */
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Uint32 headerSize;
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biWidth = SDL_ReadLE32(src);
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biHeight = SDL_ReadLE32(src);
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/* biPlanes = */ SDL_ReadLE16(src);
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biBitCount = SDL_ReadLE16(src);
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biCompression = SDL_ReadLE32(src);
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/* biSizeImage = */ SDL_ReadLE32(src);
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/* biXPelsPerMeter = */ SDL_ReadLE32(src);
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/* biYPelsPerMeter = */ SDL_ReadLE32(src);
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biClrUsed = SDL_ReadLE32(src);
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/* biClrImportant = */ SDL_ReadLE32(src);
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/* 64 == BITMAPCOREHEADER2, an incompatible OS/2 2.x extension. Skip this stuff for now. */
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if (biSize == 64) {
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/* ignore these extra fields. */
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if (biCompression == BI_BITFIELDS) {
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/* this value is actually huffman compression in this variant. */
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SDL_SetError("Compressed BMP files not supported");
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was_error = SDL_TRUE;
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goto done;
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}
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} else {
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/* This is complicated. If compression is BI_BITFIELDS, then
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we have 3 DWORDS that specify the RGB masks. This is either
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stored here in an BITMAPV2INFOHEADER (which only differs in
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that it adds these RGB masks) and biSize >= 52, or we've got
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these masks stored in the exact same place, but strictly
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speaking, this is the bmiColors field in BITMAPINFO immediately
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following the legacy v1 info header, just past biSize. */
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if (biCompression == BI_BITFIELDS) {
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haveRGBMasks = SDL_TRUE;
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Rmask = SDL_ReadLE32(src);
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Gmask = SDL_ReadLE32(src);
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Bmask = SDL_ReadLE32(src);
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/* ...v3 adds an alpha mask. */
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if (biSize >= 56) { /* BITMAPV3INFOHEADER; adds alpha mask */
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haveAlphaMask = SDL_TRUE;
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Amask = SDL_ReadLE32(src);
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}
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} else {
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/* the mask fields are ignored for v2+ headers if not BI_BITFIELD. */
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if (biSize >= 52) { /* BITMAPV2INFOHEADER; adds RGB masks */
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/*Rmask = */ SDL_ReadLE32(src);
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/*Gmask = */ SDL_ReadLE32(src);
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/*Bmask = */ SDL_ReadLE32(src);
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}
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if (biSize >= 56) { /* BITMAPV3INFOHEADER; adds alpha mask */
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/*Amask = */ SDL_ReadLE32(src);
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}
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}
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/* Insert other fields here; Wikipedia and MSDN say we're up to
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v5 of this header, but we ignore those for now (they add gamma,
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color spaces, etc). Ignoring the weird OS/2 2.x format, we
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currently parse up to v3 correctly (hopefully!). */
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}
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/* skip any header bytes we didn't handle... */
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headerSize = (Uint32) (SDL_RWtell(src) - (fp_offset + 14));
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if (biSize > headerSize) {
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SDL_RWseek(src, (biSize - headerSize), RW_SEEK_CUR);
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}
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}
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if (biHeight < 0) {
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topDown = SDL_TRUE;
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biHeight = -biHeight;
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} else {
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topDown = SDL_FALSE;
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}
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/* Check for read error */
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if (SDL_strcmp(SDL_GetError(), "") != 0) {
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was_error = SDL_TRUE;
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goto done;
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}
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/* Expand 1 and 4 bit bitmaps to 8 bits per pixel */
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switch (biBitCount) {
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case 1:
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case 4:
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ExpandBMP = biBitCount;
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biBitCount = 8;
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break;
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default:
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ExpandBMP = 0;
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break;
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}
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/* We don't support any BMP compression right now */
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switch (biCompression) {
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case BI_RGB:
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/* If there are no masks, use the defaults */
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SDL_assert(!haveRGBMasks);
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SDL_assert(!haveAlphaMask);
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/* Default values for the BMP format */
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switch (biBitCount) {
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case 15:
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case 16:
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Rmask = 0x7C00;
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Gmask = 0x03E0;
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Bmask = 0x001F;
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break;
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case 24:
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#if SDL_BYTEORDER == SDL_BIG_ENDIAN
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Rmask = 0x000000FF;
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Gmask = 0x0000FF00;
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Bmask = 0x00FF0000;
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#else
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Rmask = 0x00FF0000;
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Gmask = 0x0000FF00;
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Bmask = 0x000000FF;
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#endif
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break;
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case 32:
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/* We don't know if this has alpha channel or not */
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correctAlpha = SDL_TRUE;
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Amask = 0xFF000000;
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Rmask = 0x00FF0000;
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Gmask = 0x0000FF00;
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Bmask = 0x000000FF;
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break;
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default:
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break;
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}
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break;
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case BI_BITFIELDS:
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break; /* we handled this in the info header. */
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default:
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SDL_SetError("Compressed BMP files not supported");
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was_error = SDL_TRUE;
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goto done;
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}
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/* Create a compatible surface, note that the colors are RGB ordered */
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surface =
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SDL_CreateRGBSurface(0, biWidth, biHeight, biBitCount, Rmask, Gmask,
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Bmask, Amask);
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if (surface == NULL) {
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was_error = SDL_TRUE;
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goto done;
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}
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/* Load the palette, if any */
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palette = (surface->format)->palette;
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if (palette) {
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SDL_assert(biBitCount <= 8);
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if (biClrUsed == 0) {
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biClrUsed = 1 << biBitCount;
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}
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if ((int) biClrUsed > palette->ncolors) {
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SDL_Color *colors;
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int ncolors = biClrUsed;
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colors =
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(SDL_Color *) SDL_realloc(palette->colors,
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ncolors *
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sizeof(*palette->colors));
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if (!colors) {
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SDL_OutOfMemory();
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was_error = SDL_TRUE;
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goto done;
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}
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palette->ncolors = ncolors;
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palette->colors = colors;
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} else if ((int) biClrUsed < palette->ncolors) {
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palette->ncolors = biClrUsed;
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}
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if (biSize == 12) {
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for (i = 0; i < (int) biClrUsed; ++i) {
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SDL_RWread(src, &palette->colors[i].b, 1, 1);
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SDL_RWread(src, &palette->colors[i].g, 1, 1);
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SDL_RWread(src, &palette->colors[i].r, 1, 1);
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palette->colors[i].a = SDL_ALPHA_OPAQUE;
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}
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} else {
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for (i = 0; i < (int) biClrUsed; ++i) {
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SDL_RWread(src, &palette->colors[i].b, 1, 1);
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SDL_RWread(src, &palette->colors[i].g, 1, 1);
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SDL_RWread(src, &palette->colors[i].r, 1, 1);
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SDL_RWread(src, &palette->colors[i].a, 1, 1);
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/* According to Microsoft documentation, the fourth element
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is reserved and must be zero, so we shouldn't treat it as
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alpha.
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*/
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palette->colors[i].a = SDL_ALPHA_OPAQUE;
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}
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}
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}
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/* Read the surface pixels. Note that the bmp image is upside down */
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if (SDL_RWseek(src, fp_offset + bfOffBits, RW_SEEK_SET) < 0) {
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SDL_Error(SDL_EFSEEK);
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was_error = SDL_TRUE;
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goto done;
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}
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top = (Uint8 *)surface->pixels;
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end = (Uint8 *)surface->pixels+(surface->h*surface->pitch);
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switch (ExpandBMP) {
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case 1:
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bmpPitch = (biWidth + 7) >> 3;
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pad = (((bmpPitch) % 4) ? (4 - ((bmpPitch) % 4)) : 0);
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break;
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case 4:
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bmpPitch = (biWidth + 1) >> 1;
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pad = (((bmpPitch) % 4) ? (4 - ((bmpPitch) % 4)) : 0);
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break;
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default:
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pad = ((surface->pitch % 4) ? (4 - (surface->pitch % 4)) : 0);
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break;
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}
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if (topDown) {
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bits = top;
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} else {
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bits = end - surface->pitch;
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}
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while (bits >= top && bits < end) {
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switch (ExpandBMP) {
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case 1:
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case 4:{
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Uint8 pixel = 0;
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int shift = (8 - ExpandBMP);
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for (i = 0; i < surface->w; ++i) {
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if (i % (8 / ExpandBMP) == 0) {
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if (!SDL_RWread(src, &pixel, 1, 1)) {
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SDL_SetError("Error reading from BMP");
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was_error = SDL_TRUE;
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goto done;
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}
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}
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*(bits + i) = (pixel >> shift);
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pixel <<= ExpandBMP;
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}
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}
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break;
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default:
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if (SDL_RWread(src, bits, 1, surface->pitch)
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!= surface->pitch) {
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SDL_Error(SDL_EFREAD);
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was_error = SDL_TRUE;
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goto done;
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}
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#if SDL_BYTEORDER == SDL_BIG_ENDIAN
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/* Byte-swap the pixels if needed. Note that the 24bpp
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case has already been taken care of above. */
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switch (biBitCount) {
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case 15:
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case 16:{
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Uint16 *pix = (Uint16 *) bits;
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for (i = 0; i < surface->w; i++)
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pix[i] = SDL_Swap16(pix[i]);
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break;
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}
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case 32:{
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Uint32 *pix = (Uint32 *) bits;
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for (i = 0; i < surface->w; i++)
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pix[i] = SDL_Swap32(pix[i]);
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break;
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}
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}
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#endif
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break;
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}
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/* Skip padding bytes, ugh */
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if (pad) {
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Uint8 padbyte;
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for (i = 0; i < pad; ++i) {
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SDL_RWread(src, &padbyte, 1, 1);
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}
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}
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if (topDown) {
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bits += surface->pitch;
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} else {
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bits -= surface->pitch;
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}
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}
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if (correctAlpha) {
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CorrectAlphaChannel(surface);
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}
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done:
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if (was_error) {
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if (src) {
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SDL_RWseek(src, fp_offset, RW_SEEK_SET);
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}
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SDL_FreeSurface(surface);
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surface = NULL;
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}
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if (freesrc && src) {
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SDL_RWclose(src);
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}
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return (surface);
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}
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int
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SDL_SaveBMP_RW(SDL_Surface * saveme, SDL_RWops * dst, int freedst)
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{
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Sint64 fp_offset;
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int i, pad;
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SDL_Surface *surface;
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Uint8 *bits;
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/* The Win32 BMP file header (14 bytes) */
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char magic[2] = { 'B', 'M' };
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Uint32 bfSize;
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Uint16 bfReserved1;
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Uint16 bfReserved2;
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Uint32 bfOffBits;
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/* The Win32 BITMAPINFOHEADER struct (40 bytes) */
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Uint32 biSize;
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Sint32 biWidth;
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Sint32 biHeight;
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Uint16 biPlanes;
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Uint16 biBitCount;
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Uint32 biCompression;
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Uint32 biSizeImage;
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Sint32 biXPelsPerMeter;
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Sint32 biYPelsPerMeter;
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Uint32 biClrUsed;
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Uint32 biClrImportant;
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/* Make sure we have somewhere to save */
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surface = NULL;
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if (dst) {
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SDL_bool save32bit = SDL_FALSE;
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#ifdef SAVE_32BIT_BMP
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/* We can save alpha information in a 32-bit BMP */
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if (saveme->map->info.flags & SDL_COPY_COLORKEY ||
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saveme->format->Amask) {
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save32bit = SDL_TRUE;
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}
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#endif /* SAVE_32BIT_BMP */
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if (saveme->format->palette && !save32bit) {
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if (saveme->format->BitsPerPixel == 8) {
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surface = saveme;
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} else {
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SDL_SetError("%d bpp BMP files not supported",
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saveme->format->BitsPerPixel);
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}
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} else if ((saveme->format->BitsPerPixel == 24) &&
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#if SDL_BYTEORDER == SDL_LIL_ENDIAN
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(saveme->format->Rmask == 0x00FF0000) &&
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(saveme->format->Gmask == 0x0000FF00) &&
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(saveme->format->Bmask == 0x000000FF)
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#else
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(saveme->format->Rmask == 0x000000FF) &&
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(saveme->format->Gmask == 0x0000FF00) &&
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(saveme->format->Bmask == 0x00FF0000)
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#endif
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) {
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surface = saveme;
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} else {
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SDL_PixelFormat format;
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/* If the surface has a colorkey or alpha channel we'll save a
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32-bit BMP with alpha channel, otherwise save a 24-bit BMP. */
|
|
if (save32bit) {
|
|
SDL_InitFormat(&format,
|
|
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
|
|
SDL_PIXELFORMAT_ARGB8888
|
|
#else
|
|
SDL_PIXELFORMAT_BGRA8888
|
|
#endif
|
|
);
|
|
} else {
|
|
SDL_InitFormat(&format, SDL_PIXELFORMAT_BGR24);
|
|
}
|
|
surface = SDL_ConvertSurface(saveme, &format, 0);
|
|
if (!surface) {
|
|
SDL_SetError("Couldn't convert image to %d bpp",
|
|
format.BitsPerPixel);
|
|
}
|
|
}
|
|
} else {
|
|
/* Set no error here because it may overwrite a more useful message from
|
|
SDL_RWFromFile() if SDL_SaveBMP_RW() is called from SDL_SaveBMP(). */
|
|
return -1;
|
|
}
|
|
|
|
if (surface && (SDL_LockSurface(surface) == 0)) {
|
|
const int bw = surface->w * surface->format->BytesPerPixel;
|
|
|
|
/* Set the BMP file header values */
|
|
bfSize = 0; /* We'll write this when we're done */
|
|
bfReserved1 = 0;
|
|
bfReserved2 = 0;
|
|
bfOffBits = 0; /* We'll write this when we're done */
|
|
|
|
/* Write the BMP file header values */
|
|
fp_offset = SDL_RWtell(dst);
|
|
SDL_ClearError();
|
|
SDL_RWwrite(dst, magic, 2, 1);
|
|
SDL_WriteLE32(dst, bfSize);
|
|
SDL_WriteLE16(dst, bfReserved1);
|
|
SDL_WriteLE16(dst, bfReserved2);
|
|
SDL_WriteLE32(dst, bfOffBits);
|
|
|
|
/* Set the BMP info values */
|
|
biSize = 40;
|
|
biWidth = surface->w;
|
|
biHeight = surface->h;
|
|
biPlanes = 1;
|
|
biBitCount = surface->format->BitsPerPixel;
|
|
biCompression = BI_RGB;
|
|
biSizeImage = surface->h * surface->pitch;
|
|
biXPelsPerMeter = 0;
|
|
biYPelsPerMeter = 0;
|
|
if (surface->format->palette) {
|
|
biClrUsed = surface->format->palette->ncolors;
|
|
} else {
|
|
biClrUsed = 0;
|
|
}
|
|
biClrImportant = 0;
|
|
|
|
/* Write the BMP info values */
|
|
SDL_WriteLE32(dst, biSize);
|
|
SDL_WriteLE32(dst, biWidth);
|
|
SDL_WriteLE32(dst, biHeight);
|
|
SDL_WriteLE16(dst, biPlanes);
|
|
SDL_WriteLE16(dst, biBitCount);
|
|
SDL_WriteLE32(dst, biCompression);
|
|
SDL_WriteLE32(dst, biSizeImage);
|
|
SDL_WriteLE32(dst, biXPelsPerMeter);
|
|
SDL_WriteLE32(dst, biYPelsPerMeter);
|
|
SDL_WriteLE32(dst, biClrUsed);
|
|
SDL_WriteLE32(dst, biClrImportant);
|
|
|
|
/* Write the palette (in BGR color order) */
|
|
if (surface->format->palette) {
|
|
SDL_Color *colors;
|
|
int ncolors;
|
|
|
|
colors = surface->format->palette->colors;
|
|
ncolors = surface->format->palette->ncolors;
|
|
for (i = 0; i < ncolors; ++i) {
|
|
SDL_RWwrite(dst, &colors[i].b, 1, 1);
|
|
SDL_RWwrite(dst, &colors[i].g, 1, 1);
|
|
SDL_RWwrite(dst, &colors[i].r, 1, 1);
|
|
SDL_RWwrite(dst, &colors[i].a, 1, 1);
|
|
}
|
|
}
|
|
|
|
/* Write the bitmap offset */
|
|
bfOffBits = (Uint32)(SDL_RWtell(dst) - fp_offset);
|
|
if (SDL_RWseek(dst, fp_offset + 10, RW_SEEK_SET) < 0) {
|
|
SDL_Error(SDL_EFSEEK);
|
|
}
|
|
SDL_WriteLE32(dst, bfOffBits);
|
|
if (SDL_RWseek(dst, fp_offset + bfOffBits, RW_SEEK_SET) < 0) {
|
|
SDL_Error(SDL_EFSEEK);
|
|
}
|
|
|
|
/* Write the bitmap image upside down */
|
|
bits = (Uint8 *) surface->pixels + (surface->h * surface->pitch);
|
|
pad = ((bw % 4) ? (4 - (bw % 4)) : 0);
|
|
while (bits > (Uint8 *) surface->pixels) {
|
|
bits -= surface->pitch;
|
|
if (SDL_RWwrite(dst, bits, 1, bw) != bw) {
|
|
SDL_Error(SDL_EFWRITE);
|
|
break;
|
|
}
|
|
if (pad) {
|
|
const Uint8 padbyte = 0;
|
|
for (i = 0; i < pad; ++i) {
|
|
SDL_RWwrite(dst, &padbyte, 1, 1);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Write the BMP file size */
|
|
bfSize = (Uint32)(SDL_RWtell(dst) - fp_offset);
|
|
if (SDL_RWseek(dst, fp_offset + 2, RW_SEEK_SET) < 0) {
|
|
SDL_Error(SDL_EFSEEK);
|
|
}
|
|
SDL_WriteLE32(dst, bfSize);
|
|
if (SDL_RWseek(dst, fp_offset + bfSize, RW_SEEK_SET) < 0) {
|
|
SDL_Error(SDL_EFSEEK);
|
|
}
|
|
|
|
/* Close it up.. */
|
|
SDL_UnlockSurface(surface);
|
|
if (surface != saveme) {
|
|
SDL_FreeSurface(surface);
|
|
}
|
|
}
|
|
|
|
if (freedst && dst) {
|
|
SDL_RWclose(dst);
|
|
}
|
|
return ((SDL_strcmp(SDL_GetError(), "") == 0) ? 0 : -1);
|
|
}
|
|
|
|
/* vi: set ts=4 sw=4 expandtab: */
|