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software: Correctly track viewport and cliprect. 

Fixes Bugzilla #4457.
Ryan C. Gordon 2019-06-11 14:09:53 -04:00
parent a2f2b73554
commit 04fedce0e8
1 changed files with 46 additions and 19 deletions
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65
src/render/software/SDL_render_sw.c
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@ -37,6 +37,13 @@
/* SDL surface based renderer implementation */
typedef struct
{
const SDL_Rect *viewport;
const SDL_Rect *cliprect;
SDL_bool surface_cliprect_dirty;
} SW_DrawStateCache;
typedef struct
{
SDL_Surface *surface;
@ -568,18 +575,44 @@ PrepTextureForCopy(const SDL_RenderCommand *cmd)
SDL_SetSurfaceBlendMode(surface, blend);
}
static void
SetDrawState(SDL_Surface *surface, SW_DrawStateCache *drawstate)
{
if (drawstate->surface_cliprect_dirty) {
const SDL_Rect *viewport = drawstate->viewport;
const SDL_Rect *cliprect = drawstate->cliprect;
SDL_assert(viewport != NULL); /* the higher level should have forced a SDL_RENDERCMD_SETVIEWPORT */
if (cliprect != NULL) {
SDL_Rect clip_rect;
clip_rect.x = cliprect->x + viewport->x;
clip_rect.y = cliprect->y + viewport->y;
clip_rect.w = cliprect->w;
clip_rect.h = cliprect->h;
SDL_IntersectRect(viewport, &clip_rect, &clip_rect);
SDL_SetClipRect(surface, &clip_rect);
} else {
SDL_SetClipRect(surface, drawstate->viewport);
}
drawstate->surface_cliprect_dirty = SDL_FALSE;
}
}
static int
SW_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertices, size_t vertsize)
{
SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
SDL_Surface *surface = SW_ActivateRenderer(renderer);
const SDL_Rect *viewport = NULL;
const SDL_Rect *cliprect = NULL;
SW_DrawStateCache drawstate;
if (!surface) {
return -1;
}
drawstate.viewport = NULL;
drawstate.cliprect = NULL;
drawstate.surface_cliprect_dirty = SDL_TRUE;
while (cmd) {
switch (cmd->command) {
case SDL_RENDERCMD_SETDRAWCOLOR: {
@ -587,25 +620,14 @@ SW_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertic
}
case SDL_RENDERCMD_SETVIEWPORT: {
viewport = &cmd->data.viewport.rect;
SDL_SetClipRect(data->surface, viewport);
drawstate.viewport = &cmd->data.viewport.rect;
drawstate.surface_cliprect_dirty = SDL_TRUE;
break;
}
case SDL_RENDERCMD_SETCLIPRECT: {
SDL_assert(viewport != NULL);
cliprect = cmd->data.cliprect.enabled ? &cmd->data.cliprect.rect : NULL;
if (cliprect) {
SDL_Rect clip_rect;
clip_rect.x = cliprect->x + viewport->x;
clip_rect.y = cliprect->y + viewport->y;
clip_rect.w = cliprect->w;
clip_rect.h = cliprect->h;
SDL_IntersectRect(viewport, &clip_rect, &clip_rect);
SDL_SetClipRect(surface, &clip_rect);
} else {
SDL_SetClipRect(surface, viewport);
}
drawstate.cliprect = cmd->data.cliprect.enabled ? &cmd->data.cliprect.rect : NULL;
drawstate.surface_cliprect_dirty = SDL_TRUE;
break;
}
@ -614,11 +636,10 @@ SW_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertic
const Uint8 g = cmd->data.color.g;
const Uint8 b = cmd->data.color.b;
const Uint8 a = cmd->data.color.a;
const SDL_Rect clip_rect = surface->clip_rect;
/* By definition the clear ignores the clip rect */
SDL_SetClipRect(surface, NULL);
SDL_FillRect(surface, NULL, SDL_MapRGBA(surface->format, r, g, b, a));
SDL_SetClipRect(surface, &clip_rect);
drawstate.surface_cliprect_dirty = SDL_TRUE;
break;
}
@ -630,6 +651,7 @@ SW_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertic
const int count = (int) cmd->data.draw.count;
const SDL_Point *verts = (SDL_Point *) (((Uint8 *) vertices) + cmd->data.draw.first);
const SDL_BlendMode blend = cmd->data.draw.blend;
SetDrawState(surface, &drawstate);
if (blend == SDL_BLENDMODE_NONE) {
SDL_DrawPoints(surface, verts, count, SDL_MapRGBA(surface->format, r, g, b, a));
} else {
@ -646,6 +668,7 @@ SW_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertic
const int count = (int) cmd->data.draw.count;
const SDL_Point *verts = (SDL_Point *) (((Uint8 *) vertices) + cmd->data.draw.first);
const SDL_BlendMode blend = cmd->data.draw.blend;
SetDrawState(surface, &drawstate);
if (blend == SDL_BLENDMODE_NONE) {
SDL_DrawLines(surface, verts, count, SDL_MapRGBA(surface->format, r, g, b, a));
} else {
@ -662,6 +685,7 @@ SW_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertic
const int count = (int) cmd->data.draw.count;
const SDL_Rect *verts = (SDL_Rect *) (((Uint8 *) vertices) + cmd->data.draw.first);
const SDL_BlendMode blend = cmd->data.draw.blend;
SetDrawState(surface, &drawstate);
if (blend == SDL_BLENDMODE_NONE) {
SDL_FillRects(surface, verts, count, SDL_MapRGBA(surface->format, r, g, b, a));
} else {
@ -677,6 +701,8 @@ SW_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertic
SDL_Texture *texture = cmd->data.draw.texture;
SDL_Surface *src = (SDL_Surface *) texture->driverdata;
SetDrawState(surface, &drawstate);
PrepTextureForCopy(cmd);
if ( srcrect->w == dstrect->w && srcrect->h == dstrect->h ) {
@ -693,6 +719,7 @@ SW_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertic
case SDL_RENDERCMD_COPY_EX: {
const CopyExData *copydata = (CopyExData *) (((Uint8 *) vertices) + cmd->data.draw.first);
SetDrawState(surface, &drawstate);
PrepTextureForCopy(cmd);
SW_RenderCopyEx(renderer, surface, cmd->data.draw.texture, &copydata->srcrect,
&copydata->dstrect, copydata->angle, &copydata->center, copydata->flip);