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SDL_render_sw.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2011 Sam Lantinga
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This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
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#if !SDL_RENDER_DISABLED
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#include "../SDL_sysrender.h"
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#include "SDL_draw.h"
#include "SDL_blendfillrect.h"
#include "SDL_blendline.h"
#include "SDL_blendpoint.h"
#include "SDL_drawline.h"
#include "SDL_drawpoint.h"
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/* SDL surface based renderer implementation */
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static SDL_Renderer *SW_CreateRenderer(SDL_Window * window, Uint32 flags);
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static void SW_WindowEvent(SDL_Renderer * renderer,
const SDL_WindowEvent *event);
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static int SW_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture);
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static int SW_SetTextureColorMod(SDL_Renderer * renderer,
SDL_Texture * texture);
static int SW_SetTextureAlphaMod(SDL_Renderer * renderer,
SDL_Texture * texture);
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static int SW_SetTextureBlendMode(SDL_Renderer * renderer,
SDL_Texture * texture);
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static int SW_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect, const void *pixels,
int pitch);
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static int SW_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
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const SDL_Rect * rect, void **pixels, int *pitch);
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static void SW_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture);
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static int SW_UpdateViewport(SDL_Renderer * renderer);
static int SW_RenderClear(SDL_Renderer * renderer);
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static int SW_RenderDrawPoints(SDL_Renderer * renderer,
const SDL_Point * points, int count);
static int SW_RenderDrawLines(SDL_Renderer * renderer,
const SDL_Point * points, int count);
static int SW_RenderFillRects(SDL_Renderer * renderer,
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const SDL_Rect * rects, int count);
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static int SW_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
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const SDL_Rect * srcrect, const SDL_Rect * dstrect);
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static int SW_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
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Uint32 format, void * pixels, int pitch);
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static void SW_RenderPresent(SDL_Renderer * renderer);
static void SW_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture);
static void SW_DestroyRenderer(SDL_Renderer * renderer);
SDL_RenderDriver SW_RenderDriver = {
SW_CreateRenderer,
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{
"software",
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SDL_RENDERER_SOFTWARE,
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SDL_PIXELFORMAT_RGB555,
SDL_PIXELFORMAT_RGB565,
SDL_PIXELFORMAT_RGB888,
SDL_PIXELFORMAT_BGR888,
SDL_PIXELFORMAT_ARGB8888,
SDL_PIXELFORMAT_RGBA8888,
SDL_PIXELFORMAT_ABGR8888,
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SDL_PIXELFORMAT_BGRA8888
},
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0,
0}
};
typedef struct
{
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SDL_Surface *surface;
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} SW_RenderData;
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static SDL_Surface *
SW_ActivateRenderer(SDL_Renderer * renderer)
{
SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
if (!data->surface) {
data->surface = SDL_GetWindowSurface(renderer->window);
SW_UpdateViewport(renderer);
}
return data->surface;
}
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SDL_Renderer *
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SW_CreateRendererForSurface(SDL_Surface * surface)
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{
SDL_Renderer *renderer;
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SW_RenderData *data;
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if (!surface) {
SDL_SetError("Can't create renderer for NULL surface");
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return NULL;
}
renderer = (SDL_Renderer *) SDL_calloc(1, sizeof(*renderer));
if (!renderer) {
SDL_OutOfMemory();
return NULL;
}
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data = (SW_RenderData *) SDL_calloc(1, sizeof(*data));
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if (!data) {
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SW_DestroyRenderer(renderer);
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SDL_OutOfMemory();
return NULL;
}
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data->surface = surface;
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renderer->WindowEvent = SW_WindowEvent;
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renderer->CreateTexture = SW_CreateTexture;
renderer->SetTextureColorMod = SW_SetTextureColorMod;
renderer->SetTextureAlphaMod = SW_SetTextureAlphaMod;
renderer->SetTextureBlendMode = SW_SetTextureBlendMode;
renderer->UpdateTexture = SW_UpdateTexture;
renderer->LockTexture = SW_LockTexture;
renderer->UnlockTexture = SW_UnlockTexture;
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renderer->UpdateViewport = SW_UpdateViewport;
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renderer->DestroyTexture = SW_DestroyTexture;
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renderer->RenderClear = SW_RenderClear;
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renderer->RenderDrawPoints = SW_RenderDrawPoints;
renderer->RenderDrawLines = SW_RenderDrawLines;
renderer->RenderFillRects = SW_RenderFillRects;
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renderer->RenderCopy = SW_RenderCopy;
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renderer->RenderReadPixels = SW_RenderReadPixels;
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renderer->RenderPresent = SW_RenderPresent;
renderer->DestroyRenderer = SW_DestroyRenderer;
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renderer->info = SW_RenderDriver.info;
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renderer->driverdata = data;
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SW_ActivateRenderer(renderer);
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return renderer;
}
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SDL_Renderer *
SW_CreateRenderer(SDL_Window * window, Uint32 flags)
{
SDL_Surface *surface;
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surface = SDL_GetWindowSurface(window);
if (!surface) {
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return NULL;
}
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return SW_CreateRendererForSurface(surface);
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static void
SW_WindowEvent(SDL_Renderer * renderer, const SDL_WindowEvent *event)
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{
SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
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if (event->event == SDL_WINDOWEVENT_SIZE_CHANGED) {
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data->surface = NULL;
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SW_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
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int bpp;
Uint32 Rmask, Gmask, Bmask, Amask;
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if (!SDL_PixelFormatEnumToMasks
(texture->format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
SDL_SetError("Unknown texture format");
return -1;
}
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texture->driverdata =
SDL_CreateRGBSurface(0, texture->w, texture->h, bpp, Rmask, Gmask,
Bmask, Amask);
SDL_SetSurfaceColorMod(texture->driverdata, texture->r, texture->g,
texture->b);
SDL_SetSurfaceAlphaMod(texture->driverdata, texture->a);
SDL_SetSurfaceBlendMode(texture->driverdata, texture->blendMode);
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if (texture->access == SDL_TEXTUREACCESS_STATIC) {
SDL_SetSurfaceRLE(texture->driverdata, 1);
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}
if (!texture->driverdata) {
return -1;
}
return 0;
}
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static int
SW_SetTextureColorMod(SDL_Renderer * renderer, SDL_Texture * texture)
{
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SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
return SDL_SetSurfaceColorMod(surface, texture->r, texture->g,
texture->b);
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}
static int
SW_SetTextureAlphaMod(SDL_Renderer * renderer, SDL_Texture * texture)
{
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SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
return SDL_SetSurfaceAlphaMod(surface, texture->a);
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}
static int
SW_SetTextureBlendMode(SDL_Renderer * renderer, SDL_Texture * texture)
{
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SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
return SDL_SetSurfaceBlendMode(surface, texture->blendMode);
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SW_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect, const void *pixels, int pitch)
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SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
Uint8 *src, *dst;
int row;
size_t length;
src = (Uint8 *) pixels;
dst = (Uint8 *) surface->pixels +
rect->y * surface->pitch +
rect->x * surface->format->BytesPerPixel;
length = rect->w * surface->format->BytesPerPixel;
for (row = 0; row < rect->h; ++row) {
SDL_memcpy(dst, src, length);
src += pitch;
dst += surface->pitch;
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}
static int
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SW_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
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const SDL_Rect * rect, void **pixels, int *pitch)
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SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
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*pixels =
(void *) ((Uint8 *) surface->pixels + rect->y * surface->pitch +
rect->x * surface->format->BytesPerPixel);
*pitch = surface->pitch;
return 0;
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}
static void
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SW_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture)
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static int
SW_UpdateViewport(SDL_Renderer * renderer)
{
SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
SDL_Surface *surface = data->surface;
if (!surface) {
/* We'll update the viewport after we recreate the surface */
return 0;
}
if (!renderer->viewport.w && !renderer->viewport.h) {
/* There may be no window, so update the viewport directly */
renderer->viewport.w = surface->w;
renderer->viewport.h = surface->h;
}
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SDL_SetClipRect(data->surface, &renderer->viewport);
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return 0;
}
static int
SW_RenderClear(SDL_Renderer * renderer)
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{
SDL_Surface *surface = SW_ActivateRenderer(renderer);
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Uint32 color;
SDL_Rect clip_rect;
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if (!surface) {
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color = SDL_MapRGBA(surface->format,
renderer->r, renderer->g, renderer->b, renderer->a);
/* By definition the clear ignores the clip rect */
clip_rect = surface->clip_rect;
SDL_SetClipRect(surface, NULL);
SDL_FillRect(surface, NULL, color);
SDL_SetClipRect(surface, &clip_rect);
return 0;
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static int
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SW_RenderDrawPoints(SDL_Renderer * renderer, const SDL_Point * points,
int count)
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SDL_Surface *surface = SW_ActivateRenderer(renderer);
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SDL_Point *temp = NULL;
int status;
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if (!surface) {
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return -1;
}
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if (renderer->viewport.x || renderer->viewport.y) {
int i;
int x = renderer->viewport.x;
int y = renderer->viewport.y;
temp = SDL_stack_alloc(SDL_Point, count);
for (i = 0; i < count; ++i) {
temp[i].x = x + points[i].x;
temp[i].y = y + points[i].x;
}
points = temp;
}
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/* Draw the points! */
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if (renderer->blendMode == SDL_BLENDMODE_NONE) {
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Uint32 color = SDL_MapRGBA(surface->format,
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renderer->r, renderer->g, renderer->b,
renderer->a);
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status = SDL_DrawPoints(surface, points, count, color);
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} else {
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status = SDL_BlendPoints(surface, points, count,
renderer->blendMode,
renderer->r, renderer->g, renderer->b,
renderer->a);
}
if (temp) {
SDL_stack_free(temp);
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return status;
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}
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SW_RenderDrawLines(SDL_Renderer * renderer, const SDL_Point * points,
int count)
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SDL_Surface *surface = SW_ActivateRenderer(renderer);
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SDL_Point *temp = NULL;
int status;
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if (!surface) {
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return -1;
}
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if (renderer->viewport.x || renderer->viewport.y) {
int i;
int x = renderer->viewport.x;
int y = renderer->viewport.y;
temp = SDL_stack_alloc(SDL_Point, count);
for (i = 0; i < count; ++i) {
temp[i].x = x + points[i].x;
temp[i].y = y + points[i].y;
}
points = temp;
}
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/* Draw the lines! */
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if (renderer->blendMode == SDL_BLENDMODE_NONE) {
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Uint32 color = SDL_MapRGBA(surface->format,
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renderer->r, renderer->g, renderer->b,
renderer->a);
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status = SDL_DrawLines(surface, points, count, color);
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status = SDL_BlendLines(surface, points, count,
renderer->blendMode,
renderer->r, renderer->g, renderer->b,
renderer->a);
}
if (temp) {
SDL_stack_free(temp);
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return status;
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SW_RenderFillRects(SDL_Renderer * renderer, const SDL_Rect * rects, int count)
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SDL_Surface *surface = SW_ActivateRenderer(renderer);
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SDL_Rect *temp = NULL;
int status;
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if (!surface) {
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return -1;
}
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if (renderer->viewport.x || renderer->viewport.y) {
int i;
int x = renderer->viewport.x;
int y = renderer->viewport.y;
temp = SDL_stack_alloc(SDL_Rect, count);
for (i = 0; i < count; ++i) {
temp[i].x = x + rects[i].x;
temp[i].y = y + rects[i].y;
temp[i].w = rects[i].w;
temp[i].h = rects[i].h;
}
rects = temp;
}
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if (renderer->blendMode == SDL_BLENDMODE_NONE) {
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Uint32 color = SDL_MapRGBA(surface->format,
renderer->r, renderer->g, renderer->b,
renderer->a);
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status = SDL_FillRects(surface, rects, count, color);
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status = SDL_BlendFillRects(surface, rects, count,
renderer->blendMode,
renderer->r, renderer->g, renderer->b,
renderer->a);
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if (temp) {
SDL_stack_free(temp);
}
return status;
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SW_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
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const SDL_Rect * srcrect, const SDL_Rect * dstrect)
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SDL_Surface *surface = SW_ActivateRenderer(renderer);
SDL_Surface *src = (SDL_Surface *) texture->driverdata;
SDL_Rect final_rect = *dstrect;
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if (!surface) {
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return -1;
}
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if (renderer->viewport.x || renderer->viewport.y) {
final_rect.x += renderer->viewport.x;
final_rect.y += renderer->viewport.y;
}
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if ( srcrect->w == final_rect.w && srcrect->h == final_rect.h ) {
return SDL_BlitSurface(src, srcrect, surface, &final_rect);
} else {
return SDL_BlitScaled(src, srcrect, surface, &final_rect);
}
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static int
SW_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
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Uint32 format, void * pixels, int pitch)
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SDL_Surface *surface = SW_ActivateRenderer(renderer);
Uint32 src_format;
void *src_pixels;
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SDL_Rect final_rect;
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if (!surface) {
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return -1;
}
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if (renderer->viewport.x || renderer->viewport.y) {
final_rect.x = renderer->viewport.x + rect->x;
final_rect.y = renderer->viewport.y + rect->y;
final_rect.w = rect->w;
final_rect.h = rect->h;
rect = &final_rect;
}
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if (rect->x < 0 || rect->x+rect->w > surface->w ||
rect->y < 0 || rect->y+rect->h > surface->h) {
SDL_SetError("Tried to read outside of surface bounds");
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return -1;
}
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src_format = surface->format->format;
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src_pixels = (void*)((Uint8 *) surface->pixels +
rect->y * surface->pitch +
rect->x * surface->format->BytesPerPixel);
return SDL_ConvertPixels(rect->w, rect->h,
src_format, src_pixels, surface->pitch,
format, pixels, pitch);
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SW_RenderPresent(SDL_Renderer * renderer)
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SDL_Window *window = renderer->window;
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if (window) {
SDL_UpdateWindowSurface(window);
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}
static void
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SW_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture)
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SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
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SDL_FreeSurface(surface);
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}
static void
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SW_DestroyRenderer(SDL_Renderer * renderer)
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SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
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if (data) {
SDL_free(data);
}
SDL_free(renderer);
}
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#endif /* !SDL_RENDER_DISABLED */
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/* vi: set ts=4 sw=4 expandtab: */