| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org> |
| |
| This software is provided 'as-is', without any express or implied |
| warranty. In no event will the authors be held liable for any damages |
| arising from the use of this software. |
| |
| Permission is granted to anyone to use this software for any purpose, |
| including commercial applications, and to alter it and redistribute it |
| freely, subject to the following restrictions: |
| |
| 1. The origin of this software must not be misrepresented; you must not |
| claim that you wrote the original software. If you use this software |
| in a product, an acknowledgment in the product documentation would be |
| appreciated but is not required. |
| 2. Altered source versions must be plainly marked as such, and must not be |
| misrepresented as being the original software. |
| 3. This notice may not be removed or altered from any source distribution. |
| */ |
| #include "SDL_internal.h" |
| |
| #ifdef SDL_VIDEO_RENDER_SW |
| |
| #include "SDL_draw.h" |
| #include "SDL_blendfillrect.h" |
| |
| static bool SDL_BlendFillRect_RGB555(SDL_Surface *dst, const SDL_Rect *rect, |
| SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
| { |
| unsigned inva = 0xff - a; |
| |
| switch (blendMode) { |
| case SDL_BLENDMODE_BLEND: |
| FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB555); |
| break; |
| case SDL_BLENDMODE_BLEND_PREMULTIPLIED: |
| FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_CLAMPED_RGB555); |
| break; |
| case SDL_BLENDMODE_ADD: |
| case SDL_BLENDMODE_ADD_PREMULTIPLIED: |
| FILLRECT(Uint16, DRAW_SETPIXEL_ADD_RGB555); |
| break; |
| case SDL_BLENDMODE_MOD: |
| FILLRECT(Uint16, DRAW_SETPIXEL_MOD_RGB555); |
| break; |
| case SDL_BLENDMODE_MUL: |
| FILLRECT(Uint16, DRAW_SETPIXEL_MUL_RGB555); |
| break; |
| default: |
| FILLRECT(Uint16, DRAW_SETPIXEL_RGB555); |
| break; |
| } |
| return true; |
| } |
| |
| static bool SDL_BlendFillRect_RGB565(SDL_Surface *dst, const SDL_Rect *rect, |
| SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
| { |
| unsigned inva = 0xff - a; |
| |
| switch (blendMode) { |
| case SDL_BLENDMODE_BLEND: |
| FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB565); |
| break; |
| case SDL_BLENDMODE_BLEND_PREMULTIPLIED: |
| FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_CLAMPED_RGB565); |
| break; |
| case SDL_BLENDMODE_ADD: |
| case SDL_BLENDMODE_ADD_PREMULTIPLIED: |
| FILLRECT(Uint16, DRAW_SETPIXEL_ADD_RGB565); |
| break; |
| case SDL_BLENDMODE_MOD: |
| FILLRECT(Uint16, DRAW_SETPIXEL_MOD_RGB565); |
| break; |
| case SDL_BLENDMODE_MUL: |
| FILLRECT(Uint16, DRAW_SETPIXEL_MUL_RGB565); |
| break; |
| default: |
| FILLRECT(Uint16, DRAW_SETPIXEL_RGB565); |
| break; |
| } |
| return true; |
| } |
| |
| static bool SDL_BlendFillRect_XRGB8888(SDL_Surface *dst, const SDL_Rect *rect, |
| SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
| { |
| unsigned inva = 0xff - a; |
| |
| switch (blendMode) { |
| case SDL_BLENDMODE_BLEND: |
| FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_XRGB8888); |
| break; |
| case SDL_BLENDMODE_BLEND_PREMULTIPLIED: |
| FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_CLAMPED_XRGB8888); |
| break; |
| case SDL_BLENDMODE_ADD: |
| case SDL_BLENDMODE_ADD_PREMULTIPLIED: |
| FILLRECT(Uint32, DRAW_SETPIXEL_ADD_XRGB8888); |
| break; |
| case SDL_BLENDMODE_MOD: |
| FILLRECT(Uint32, DRAW_SETPIXEL_MOD_XRGB8888); |
| break; |
| case SDL_BLENDMODE_MUL: |
| FILLRECT(Uint32, DRAW_SETPIXEL_MUL_XRGB8888); |
| break; |
| default: |
| FILLRECT(Uint32, DRAW_SETPIXEL_XRGB8888); |
| break; |
| } |
| return true; |
| } |
| |
| static bool SDL_BlendFillRect_ARGB8888(SDL_Surface *dst, const SDL_Rect *rect, |
| SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
| { |
| unsigned inva = 0xff - a; |
| |
| switch (blendMode) { |
| case SDL_BLENDMODE_BLEND: |
| FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_ARGB8888); |
| break; |
| case SDL_BLENDMODE_BLEND_PREMULTIPLIED: |
| FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_CLAMPED_ARGB8888); |
| break; |
| case SDL_BLENDMODE_ADD: |
| case SDL_BLENDMODE_ADD_PREMULTIPLIED: |
| FILLRECT(Uint32, DRAW_SETPIXEL_ADD_ARGB8888); |
| break; |
| case SDL_BLENDMODE_MOD: |
| FILLRECT(Uint32, DRAW_SETPIXEL_MOD_ARGB8888); |
| break; |
| case SDL_BLENDMODE_MUL: |
| FILLRECT(Uint32, DRAW_SETPIXEL_MUL_ARGB8888); |
| break; |
| default: |
| FILLRECT(Uint32, DRAW_SETPIXEL_ARGB8888); |
| break; |
| } |
| return true; |
| } |
| |
| static bool SDL_BlendFillRect_RGB(SDL_Surface *dst, const SDL_Rect *rect, |
| SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
| { |
| const SDL_PixelFormatDetails *fmt = dst->fmt; |
| unsigned inva = 0xff - a; |
| |
| switch (fmt->bytes_per_pixel) { |
| case 2: |
| switch (blendMode) { |
| case SDL_BLENDMODE_BLEND: |
| FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB); |
| break; |
| case SDL_BLENDMODE_BLEND_PREMULTIPLIED: |
| FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_CLAMPED_RGB); |
| break; |
| case SDL_BLENDMODE_ADD: |
| case SDL_BLENDMODE_ADD_PREMULTIPLIED: |
| FILLRECT(Uint16, DRAW_SETPIXEL_ADD_RGB); |
| break; |
| case SDL_BLENDMODE_MOD: |
| FILLRECT(Uint16, DRAW_SETPIXEL_MOD_RGB); |
| break; |
| case SDL_BLENDMODE_MUL: |
| FILLRECT(Uint16, DRAW_SETPIXEL_MUL_RGB); |
| break; |
| default: |
| FILLRECT(Uint16, DRAW_SETPIXEL_RGB); |
| break; |
| } |
| return true; |
| case 4: |
| switch (blendMode) { |
| case SDL_BLENDMODE_BLEND: |
| FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_RGB); |
| break; |
| case SDL_BLENDMODE_BLEND_PREMULTIPLIED: |
| FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_CLAMPED_RGB); |
| break; |
| case SDL_BLENDMODE_ADD: |
| case SDL_BLENDMODE_ADD_PREMULTIPLIED: |
| FILLRECT(Uint32, DRAW_SETPIXEL_ADD_RGB); |
| break; |
| case SDL_BLENDMODE_MOD: |
| FILLRECT(Uint32, DRAW_SETPIXEL_MOD_RGB); |
| break; |
| case SDL_BLENDMODE_MUL: |
| FILLRECT(Uint32, DRAW_SETPIXEL_MUL_RGB); |
| break; |
| default: |
| FILLRECT(Uint32, DRAW_SETPIXEL_RGB); |
| break; |
| } |
| return true; |
| default: |
| return SDL_Unsupported(); |
| } |
| } |
| |
| static bool SDL_BlendFillRect_RGBA(SDL_Surface *dst, const SDL_Rect *rect, |
| SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
| { |
| const SDL_PixelFormatDetails *fmt = dst->fmt; |
| unsigned inva = 0xff - a; |
| |
| switch (fmt->bytes_per_pixel) { |
| case 4: |
| switch (blendMode) { |
| case SDL_BLENDMODE_BLEND: |
| FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_RGBA); |
| break; |
| case SDL_BLENDMODE_BLEND_PREMULTIPLIED: |
| FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_CLAMPED_RGBA); |
| break; |
| case SDL_BLENDMODE_ADD: |
| case SDL_BLENDMODE_ADD_PREMULTIPLIED: |
| FILLRECT(Uint32, DRAW_SETPIXEL_ADD_RGBA); |
| break; |
| case SDL_BLENDMODE_MOD: |
| FILLRECT(Uint32, DRAW_SETPIXEL_MOD_RGBA); |
| break; |
| case SDL_BLENDMODE_MUL: |
| FILLRECT(Uint32, DRAW_SETPIXEL_MUL_RGBA); |
| break; |
| default: |
| FILLRECT(Uint32, DRAW_SETPIXEL_RGBA); |
| break; |
| } |
| return true; |
| default: |
| return SDL_Unsupported(); |
| } |
| } |
| |
| bool SDL_BlendFillRect(SDL_Surface *dst, const SDL_Rect *rect, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
| { |
| SDL_Rect clipped; |
| |
| CHECK_PARAM(!SDL_SurfaceValid(dst)) { |
| return SDL_InvalidParamError("SDL_BlendFillRect(): dst"); |
| } |
| |
| // This function doesn't work on surfaces < 8 bpp |
| if (SDL_BITSPERPIXEL(dst->format) < 8) { |
| return SDL_SetError("SDL_BlendFillRect(): Unsupported surface format"); |
| } |
| |
| // If 'rect' == NULL, then fill the whole surface |
| if (rect) { |
| // Perform clipping |
| if (!SDL_GetRectIntersection(rect, &dst->clip_rect, &clipped)) { |
| return true; |
| } |
| rect = &clipped; |
| } else { |
| rect = &dst->clip_rect; |
| } |
| |
| if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) { |
| r = DRAW_MUL(r, a); |
| g = DRAW_MUL(g, a); |
| b = DRAW_MUL(b, a); |
| } |
| |
| switch (dst->fmt->bits_per_pixel) { |
| case 15: |
| switch (dst->fmt->Rmask) { |
| case 0x7C00: |
| return SDL_BlendFillRect_RGB555(dst, rect, blendMode, r, g, b, a); |
| } |
| break; |
| case 16: |
| switch (dst->fmt->Rmask) { |
| case 0xF800: |
| return SDL_BlendFillRect_RGB565(dst, rect, blendMode, r, g, b, a); |
| } |
| break; |
| case 32: |
| switch (dst->fmt->Rmask) { |
| case 0x00FF0000: |
| if (!dst->fmt->Amask) { |
| return SDL_BlendFillRect_XRGB8888(dst, rect, blendMode, r, g, b, a); |
| } else { |
| return SDL_BlendFillRect_ARGB8888(dst, rect, blendMode, r, g, b, a); |
| } |
| // break; -Wunreachable-code-break |
| } |
| break; |
| default: |
| break; |
| } |
| |
| if (!dst->fmt->Amask) { |
| return SDL_BlendFillRect_RGB(dst, rect, blendMode, r, g, b, a); |
| } else { |
| return SDL_BlendFillRect_RGBA(dst, rect, blendMode, r, g, b, a); |
| } |
| } |
| |
| bool SDL_BlendFillRects(SDL_Surface *dst, const SDL_Rect *rects, int count, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
| { |
| SDL_Rect rect; |
| int i; |
| bool (*func)(SDL_Surface * dst, const SDL_Rect *rect, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) = NULL; |
| bool result = true; |
| |
| CHECK_PARAM(!SDL_SurfaceValid(dst)) { |
| return SDL_InvalidParamError("SDL_BlendFillRects(): dst"); |
| } |
| |
| // This function doesn't work on surfaces < 8 bpp |
| if (dst->fmt->bits_per_pixel < 8) { |
| return SDL_SetError("SDL_BlendFillRects(): Unsupported surface format"); |
| } |
| |
| if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) { |
| r = DRAW_MUL(r, a); |
| g = DRAW_MUL(g, a); |
| b = DRAW_MUL(b, a); |
| } |
| |
| // FIXME: Does this function pointer slow things down significantly? |
| switch (dst->fmt->bits_per_pixel) { |
| case 15: |
| switch (dst->fmt->Rmask) { |
| case 0x7C00: |
| func = SDL_BlendFillRect_RGB555; |
| } |
| break; |
| case 16: |
| switch (dst->fmt->Rmask) { |
| case 0xF800: |
| func = SDL_BlendFillRect_RGB565; |
| } |
| break; |
| case 32: |
| switch (dst->fmt->Rmask) { |
| case 0x00FF0000: |
| if (!dst->fmt->Amask) { |
| func = SDL_BlendFillRect_XRGB8888; |
| } else { |
| func = SDL_BlendFillRect_ARGB8888; |
| } |
| break; |
| } |
| break; |
| default: |
| break; |
| } |
| |
| if (!func) { |
| if (!dst->fmt->Amask) { |
| func = SDL_BlendFillRect_RGB; |
| } else { |
| func = SDL_BlendFillRect_RGBA; |
| } |
| } |
| |
| for (i = 0; i < count; ++i) { |
| // Perform clipping |
| if (!SDL_GetRectIntersection(&rects[i], &dst->clip_rect, &rect)) { |
| continue; |
| } |
| result = func(dst, &rect, blendMode, r, g, b, a); |
| } |
| return result; |
| } |
| |
| #endif // SDL_VIDEO_RENDER_SW |
