updae source to 2.0.9 source

Edward Rudd

2019-04-09 9cd2e9ec8fc0127393dfce9c0359d500c8c238be

 source/src/render/SDL_render.c

@@ -1,6 +1,6 @@
/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
  Copyright (C) 1997-2018 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
@@ -18,7 +18,7 @@
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/
#include "SDL_config.h"
#include "../SDL_internal.h"

/* The SDL 2D rendering system */

@@ -33,22 +33,52 @@
#define SDL_WINDOWRENDERDATA    "_SDL_WindowRenderData"

#define CHECK_RENDERER_MAGIC(renderer, retval) \
    SDL_assert(renderer && renderer->magic == &renderer_magic); \
    if (!renderer || renderer->magic != &renderer_magic) { \
        SDL_SetError("Invalid renderer"); \
        return retval; \
    }

#define CHECK_TEXTURE_MAGIC(texture, retval) \
    SDL_assert(texture && texture->magic == &texture_magic); \
    if (!texture || texture->magic != &texture_magic) { \
        SDL_SetError("Invalid texture"); \
        return retval; \
    }

/* Predefined blend modes */
#define SDL_COMPOSE_BLENDMODE(srcColorFactor, dstColorFactor, colorOperation, \
                              srcAlphaFactor, dstAlphaFactor, alphaOperation) \
    (SDL_BlendMode)(((Uint32)colorOperation << 0) | \
                    ((Uint32)srcColorFactor << 4) | \
                    ((Uint32)dstColorFactor << 8) | \
                    ((Uint32)alphaOperation << 16) | \
                    ((Uint32)srcAlphaFactor << 20) | \
                    ((Uint32)dstAlphaFactor << 24))

#define SDL_BLENDMODE_NONE_FULL \
    SDL_COMPOSE_BLENDMODE(SDL_BLENDFACTOR_ONE, SDL_BLENDFACTOR_ZERO, SDL_BLENDOPERATION_ADD, \
                          SDL_BLENDFACTOR_ONE, SDL_BLENDFACTOR_ZERO, SDL_BLENDOPERATION_ADD)

#define SDL_BLENDMODE_BLEND_FULL \
    SDL_COMPOSE_BLENDMODE(SDL_BLENDFACTOR_SRC_ALPHA, SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA, SDL_BLENDOPERATION_ADD, \
                          SDL_BLENDFACTOR_ONE, SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA, SDL_BLENDOPERATION_ADD)

#define SDL_BLENDMODE_ADD_FULL \
    SDL_COMPOSE_BLENDMODE(SDL_BLENDFACTOR_SRC_ALPHA, SDL_BLENDFACTOR_ONE, SDL_BLENDOPERATION_ADD, \
                          SDL_BLENDFACTOR_ZERO, SDL_BLENDFACTOR_ONE, SDL_BLENDOPERATION_ADD)

#define SDL_BLENDMODE_MOD_FULL \
    SDL_COMPOSE_BLENDMODE(SDL_BLENDFACTOR_ZERO, SDL_BLENDFACTOR_SRC_COLOR, SDL_BLENDOPERATION_ADD, \
                          SDL_BLENDFACTOR_ZERO, SDL_BLENDFACTOR_ONE, SDL_BLENDOPERATION_ADD)

#if !SDL_RENDER_DISABLED
static const SDL_RenderDriver *render_drivers[] = {
#if SDL_VIDEO_RENDER_D3D
    &D3D_RenderDriver,
#endif
#if SDL_VIDEO_RENDER_D3D11
    &D3D11_RenderDriver,
#endif
#if SDL_VIDEO_RENDER_OGL
    &GL_RenderDriver,
@@ -61,6 +91,9 @@
#endif
#if SDL_VIDEO_RENDER_DIRECTFB
    &DirectFB_RenderDriver,
#endif
#if SDL_VIDEO_RENDER_METAL
    &METAL_RenderDriver,
#endif
#if SDL_VIDEO_RENDER_PSP
    &PSP_RenderDriver,
@@ -99,7 +132,17 @@
#endif
}

static int
static void GetWindowViewportValues(SDL_Renderer *renderer, int *logical_w, int *logical_h, SDL_Rect *viewport, SDL_FPoint *scale)
{
    SDL_LockMutex(renderer->target_mutex);
    *logical_w = renderer->target ? renderer->logical_w_backup : renderer->logical_w;
    *logical_h = renderer->target ? renderer->logical_h_backup : renderer->logical_h;
    *viewport = renderer->target ? renderer->viewport_backup : renderer->viewport;
    *scale = renderer->target ? renderer->scale_backup : renderer->scale;
    SDL_UnlockMutex(renderer->target_mutex);
}

static int SDLCALL
SDL_RendererEventWatch(void *userdata, SDL_Event *event)
{
    SDL_Renderer *renderer = (SDL_Renderer *)userdata;
@@ -112,6 +155,12 @@
            }

            if (event->window.event == SDL_WINDOWEVENT_SIZE_CHANGED) {
                /* Make sure we're operating on the default render target */
                SDL_Texture *saved_target = SDL_GetRenderTarget(renderer);
                if (saved_target) {
                    SDL_SetRenderTarget(renderer, NULL);
                }

                if (renderer->logical_w) {
                    UpdateLogicalSize(renderer);
                } else {
@@ -137,6 +186,10 @@
                        renderer->UpdateViewport(renderer);
                    }
                }

                if (saved_target) {
                    SDL_SetRenderTarget(renderer, saved_target);
                }
            } else if (event->window.event == SDL_WINDOWEVENT_HIDDEN) {
                renderer->hidden = SDL_TRUE;
            } else if (event->window.event == SDL_WINDOWEVENT_SHOWN) {
@@ -145,38 +198,85 @@
                }
            } else if (event->window.event == SDL_WINDOWEVENT_MINIMIZED) {
                renderer->hidden = SDL_TRUE;
            } else if (event->window.event == SDL_WINDOWEVENT_RESTORED) {
            } else if (event->window.event == SDL_WINDOWEVENT_RESTORED || 
                       event->window.event == SDL_WINDOWEVENT_MAXIMIZED) {
                if (!(SDL_GetWindowFlags(window) & SDL_WINDOW_HIDDEN)) {
                    renderer->hidden = SDL_FALSE;
                }
            }
        }
    } else if (event->type == SDL_MOUSEMOTION) {
        if (renderer->logical_w) {
            event->motion.x -= renderer->viewport.x;
            event->motion.y -= renderer->viewport.y;
            event->motion.x = (int)(event->motion.x / renderer->scale.x);
            event->motion.y = (int)(event->motion.y / renderer->scale.y);
            if (event->motion.xrel > 0) {
                event->motion.xrel = SDL_max(1, (int)(event->motion.xrel / renderer->scale.x));
            } else if (event->motion.xrel < 0) {
                event->motion.xrel = SDL_min(-1, (int)(event->motion.xrel / renderer->scale.x));
            }
            if (event->motion.yrel > 0) {
                event->motion.yrel = SDL_max(1, (int)(event->motion.yrel / renderer->scale.y));
            } else if (event->motion.yrel < 0) {
                event->motion.yrel = SDL_min(-1, (int)(event->motion.yrel / renderer->scale.y));
        SDL_Window *window = SDL_GetWindowFromID(event->motion.windowID);
        if (window == renderer->window) {
            int logical_w, logical_h;
            SDL_Rect viewport;
            SDL_FPoint scale;
            GetWindowViewportValues(renderer, &logical_w, &logical_h, &viewport, &scale);
            if (logical_w) {
                event->motion.x -= (int)(viewport.x * renderer->dpi_scale.x);
                event->motion.y -= (int)(viewport.y * renderer->dpi_scale.y);
                event->motion.x = (int)(event->motion.x / (scale.x * renderer->dpi_scale.x));
                event->motion.y = (int)(event->motion.y / (scale.y * renderer->dpi_scale.y));
                if (event->motion.xrel > 0) {
                    event->motion.xrel = SDL_max(1, (int)(event->motion.xrel / (scale.x * renderer->dpi_scale.x)));
                } else if (event->motion.xrel < 0) {
                    event->motion.xrel = SDL_min(-1, (int)(event->motion.xrel / (scale.x * renderer->dpi_scale.x)));
                }
                if (event->motion.yrel > 0) {
                    event->motion.yrel = SDL_max(1, (int)(event->motion.yrel / (scale.y * renderer->dpi_scale.y)));
                } else if (event->motion.yrel < 0) {
                    event->motion.yrel = SDL_min(-1, (int)(event->motion.yrel / (scale.y * renderer->dpi_scale.y)));
                }
            }
        }
    } else if (event->type == SDL_MOUSEBUTTONDOWN ||
               event->type == SDL_MOUSEBUTTONUP) {
        if (renderer->logical_w) {
            event->button.x -= renderer->viewport.x;
            event->button.y -= renderer->viewport.y;
            event->button.x = (int)(event->button.x / renderer->scale.x);
            event->button.y = (int)(event->button.y / renderer->scale.y);
        SDL_Window *window = SDL_GetWindowFromID(event->button.windowID);
        if (window == renderer->window) {
            int logical_w, logical_h;
            SDL_Rect viewport;
            SDL_FPoint scale;
            GetWindowViewportValues(renderer, &logical_w, &logical_h, &viewport, &scale);
            if (logical_w) {
                event->button.x -= (int)(viewport.x * renderer->dpi_scale.x);
                event->button.y -= (int)(viewport.y * renderer->dpi_scale.y);
                event->button.x = (int)(event->button.x / (scale.x * renderer->dpi_scale.x));
                event->button.y = (int)(event->button.y / (scale.y * renderer->dpi_scale.y));
            }
        }
    } else if (event->type == SDL_FINGERDOWN ||
               event->type == SDL_FINGERUP ||
               event->type == SDL_FINGERMOTION) {
        int logical_w, logical_h;
        SDL_Rect viewport;
        SDL_FPoint scale;
        GetWindowViewportValues(renderer, &logical_w, &logical_h, &viewport, &scale);
        if (logical_w) {
            int w = 1;
            int h = 1;
            SDL_GetRendererOutputSize(renderer, &w, &h);

            event->tfinger.x *= (w - 1);
            event->tfinger.y *= (h - 1);

            event->tfinger.x -= (viewport.x * renderer->dpi_scale.x);
            event->tfinger.y -= (viewport.y * renderer->dpi_scale.y);
            event->tfinger.x = (event->tfinger.x / (scale.x * renderer->dpi_scale.x));
            event->tfinger.y = (event->tfinger.y / (scale.y * renderer->dpi_scale.y));

            if (logical_w > 1) {
                event->tfinger.x = event->tfinger.x / (logical_w - 1);
            } else {
                event->tfinger.x = 0.5f;
            }
            if (logical_h > 1) {
                event->tfinger.y = event->tfinger.y / (logical_h - 1);
            } else {
                event->tfinger.y = 0.5f;
            }
        }
    }

    return 0;
}

@@ -218,12 +318,11 @@
        return NULL;
    }

    hint = SDL_GetHint(SDL_HINT_RENDER_VSYNC);
    if (hint) {
        if (*hint == '0') {
            flags &= ~SDL_RENDERER_PRESENTVSYNC;
        } else {
    if (SDL_GetHint(SDL_HINT_RENDER_VSYNC)) {
        if (SDL_GetHintBoolean(SDL_HINT_RENDER_VSYNC, SDL_TRUE)) {
            flags |= SDL_RENDERER_PRESENTVSYNC;
        } else {
            flags &= ~SDL_RENDERER_PRESENTVSYNC;
        }
    }

@@ -272,8 +371,21 @@
    if (renderer) {
        renderer->magic = &renderer_magic;
        renderer->window = window;
        renderer->target_mutex = SDL_CreateMutex();
        renderer->scale.x = 1.0f;
        renderer->scale.y = 1.0f;
        renderer->dpi_scale.x = 1.0f;
        renderer->dpi_scale.y = 1.0f;

        if (window && renderer->GetOutputSize) {
            int window_w, window_h;
            int output_w, output_h;
            if (renderer->GetOutputSize(renderer, &output_w, &output_h) == 0) {
                SDL_GetWindowSize(renderer->window, &window_w, &window_h);
                renderer->dpi_scale.x = (float)window_w / output_w;
                renderer->dpi_scale.y = (float)window_h / output_h;
            }
        }

        if (SDL_GetWindowFlags(window) & (SDL_WINDOW_HIDDEN|SDL_WINDOW_MINIMIZED)) {
            renderer->hidden = SDL_TRUE;
@@ -307,6 +419,7 @@

    if (renderer) {
        renderer->magic = &renderer_magic;
        renderer->target_mutex = SDL_CreateMutex();
        renderer->scale.x = 1.0f;
        renderer->scale.y = 1.0f;

@@ -347,9 +460,25 @@
        SDL_GetWindowSize(renderer->window, w, h);
        return 0;
    } else {
        /* This should never happen */
        SDL_SetError("Renderer doesn't support querying output size");
        return -1;
        SDL_assert(0 && "This should never happen");
        return SDL_SetError("Renderer doesn't support querying output size");
    }
}

static SDL_bool
IsSupportedBlendMode(SDL_Renderer * renderer, SDL_BlendMode blendMode)
{
    switch (blendMode)
    {
    /* These are required to be supported by all renderers */
    case SDL_BLENDMODE_NONE:
    case SDL_BLENDMODE_BLEND:
    case SDL_BLENDMODE_ADD:
    case SDL_BLENDMODE_MOD:
        return SDL_TRUE;

    default:
        return renderer->SupportsBlendMode && renderer->SupportsBlendMode(renderer, blendMode);
    }
}

@@ -392,6 +521,22 @@
    return renderer->info.texture_formats[0];
}


static SDL_ScaleMode SDL_GetScaleMode(void)
{
    const char *hint = SDL_GetHint(SDL_HINT_RENDER_SCALE_QUALITY);

    if (!hint || SDL_strcasecmp(hint, "nearest") == 0) {
        return SDL_ScaleModeNearest;
    } else if (SDL_strcasecmp(hint, "linear") == 0) {
        return SDL_ScaleModeLinear;
    } else if (SDL_strcasecmp(hint, "best") == 0) {
        return SDL_ScaleModeBest;
    } else {
        return (SDL_ScaleMode)SDL_atoi(hint);
    }
}

SDL_Texture *
SDL_CreateTexture(SDL_Renderer * renderer, Uint32 format, int access, int w, int h)
{
@@ -401,6 +546,10 @@

    if (!format) {
        format = renderer->info.texture_formats[0];
    }
    if (SDL_BYTESPERPIXEL(format) == 0) {
        SDL_SetError("Invalid texture format");
        return NULL;
    }
    if (SDL_ISPIXELFORMAT_INDEXED(format)) {
        SDL_SetError("Palettized textures are not supported");
@@ -429,6 +578,7 @@
    texture->g = 255;
    texture->b = 255;
    texture->a = 255;
    texture->scaleMode = SDL_GetScaleMode();
    texture->renderer = renderer;
    texture->next = renderer->textures;
    if (renderer->textures) {
@@ -439,7 +589,7 @@
    if (IsSupportedFormat(renderer, format)) {
        if (renderer->CreateTexture(renderer, texture) < 0) {
            SDL_DestroyTexture(texture);
            return 0;
            return NULL;
        }
    } else {
        texture->native = SDL_CreateTexture(renderer,
@@ -500,7 +650,7 @@

    /* See what the best texture format is */
    fmt = surface->format;
    if (fmt->Amask || SDL_GetColorKey(surface, NULL) == 0) {
    if (fmt->Amask || SDL_HasColorKey(surface)) {
        needAlpha = SDL_TRUE;
    } else {
        needAlpha = SDL_FALSE;
@@ -534,6 +684,10 @@

        /* Set up a destination surface for the texture update */
        dst_fmt = SDL_AllocFormat(format);
        if (!dst_fmt) {
           SDL_DestroyTexture(texture);
           return NULL;
        }
        temp = SDL_ConvertSurface(surface, dst_fmt, 0);
        SDL_FreeFormat(dst_fmt);
        if (temp) {
@@ -555,7 +709,7 @@
        SDL_GetSurfaceAlphaMod(surface, &a);
        SDL_SetTextureAlphaMod(texture, a);

        if (SDL_GetColorKey(surface, NULL) == 0) {
        if (SDL_HasColorKey(surface)) {
            /* We converted to a texture with alpha format */
            SDL_SetTextureBlendMode(texture, SDL_BLENDMODE_BLEND);
        } else {
@@ -672,6 +826,9 @@
    CHECK_TEXTURE_MAGIC(texture, -1);

    renderer = texture->renderer;
    if (!IsSupportedBlendMode(renderer, blendMode)) {
        return SDL_Unsupported();
    }
    texture->blendMode = blendMode;
    if (texture->native) {
        return SDL_SetTextureBlendMode(texture->native, blendMode);
@@ -712,8 +869,8 @@

    if (texture->access == SDL_TEXTUREACCESS_STREAMING) {
        /* We can lock the texture and copy to it */
        void *native_pixels;
        int native_pitch;
        void *native_pixels = NULL;
        int native_pitch = 0;

        if (SDL_LockTexture(native, rect, &native_pixels, &native_pitch) < 0) {
            return -1;
@@ -723,18 +880,18 @@
        SDL_UnlockTexture(native);
    } else {
        /* Use a temporary buffer for updating */
        void *temp_pixels;
        int temp_pitch;

        temp_pitch = (((rect->w * SDL_BYTESPERPIXEL(native->format)) + 3) & ~3);
        temp_pixels = SDL_malloc(rect->h * temp_pitch);
        if (!temp_pixels) {
            return SDL_OutOfMemory();
        const int temp_pitch = (((rect->w * SDL_BYTESPERPIXEL(native->format)) + 3) & ~3);
        const size_t alloclen = rect->h * temp_pitch;
        if (alloclen > 0) {
            void *temp_pixels = SDL_malloc(alloclen);
            if (!temp_pixels) {
                return SDL_OutOfMemory();
            }
            SDL_SW_CopyYUVToRGB(texture->yuv, rect, native->format,
                                rect->w, rect->h, temp_pixels, temp_pitch);
            SDL_UpdateTexture(native, rect, temp_pixels, temp_pitch);
            SDL_free(temp_pixels);
        }
        SDL_SW_CopyYUVToRGB(texture->yuv, rect, native->format,
                            rect->w, rect->h, temp_pixels, temp_pitch);
        SDL_UpdateTexture(native, rect, temp_pixels, temp_pitch);
        SDL_free(temp_pixels);
    }
    return 0;
}
@@ -745,10 +902,14 @@
{
    SDL_Texture *native = texture->native;

    if (!rect->w || !rect->h) {
        return 0;  /* nothing to do. */
    }

    if (texture->access == SDL_TEXTUREACCESS_STREAMING) {
        /* We can lock the texture and copy to it */
        void *native_pixels;
        int native_pitch;
        void *native_pixels = NULL;
        int native_pitch = 0;

        if (SDL_LockTexture(native, rect, &native_pixels, &native_pitch) < 0) {
            return -1;
@@ -759,19 +920,19 @@
        SDL_UnlockTexture(native);
    } else {
        /* Use a temporary buffer for updating */
        void *temp_pixels;
        int temp_pitch;

        temp_pitch = (((rect->w * SDL_BYTESPERPIXEL(native->format)) + 3) & ~3);
        temp_pixels = SDL_malloc(rect->h * temp_pitch);
        if (!temp_pixels) {
            return SDL_OutOfMemory();
        const int temp_pitch = (((rect->w * SDL_BYTESPERPIXEL(native->format)) + 3) & ~3);
        const size_t alloclen = rect->h * temp_pitch;
        if (alloclen > 0) {
            void *temp_pixels = SDL_malloc(alloclen);
            if (!temp_pixels) {
                return SDL_OutOfMemory();
            }
            SDL_ConvertPixels(rect->w, rect->h,
                              texture->format, pixels, pitch,
                              native->format, temp_pixels, temp_pitch);
            SDL_UpdateTexture(native, rect, temp_pixels, temp_pitch);
            SDL_free(temp_pixels);
        }
        SDL_ConvertPixels(rect->w, rect->h,
                          texture->format, pixels, pitch,
                          native->format, temp_pixels, temp_pitch);
        SDL_UpdateTexture(native, rect, temp_pixels, temp_pitch);
        SDL_free(temp_pixels);
    }
    return 0;
}
@@ -800,7 +961,9 @@
        rect = &full_rect;
    }

    if (texture->yuv) {
    if ((rect->w == 0) || (rect->h == 0)) {
        return 0;  /* nothing to do. */
    } else if (texture->yuv) {
        return SDL_UpdateTextureYUV(texture, rect, pixels, pitch);
    } else if (texture->native) {
        return SDL_UpdateTextureNative(texture, rect, pixels, pitch);
@@ -829,10 +992,14 @@
    full_rect.h = texture->h;
    rect = &full_rect;

    if (!rect->w || !rect->h) {
        return 0;  /* nothing to do. */
    }

    if (texture->access == SDL_TEXTUREACCESS_STREAMING) {
        /* We can lock the texture and copy to it */
        void *native_pixels;
        int native_pitch;
        void *native_pixels = NULL;
        int native_pitch = 0;

        if (SDL_LockTexture(native, rect, &native_pixels, &native_pitch) < 0) {
            return -1;
@@ -842,18 +1009,18 @@
        SDL_UnlockTexture(native);
    } else {
        /* Use a temporary buffer for updating */
        void *temp_pixels;
        int temp_pitch;

        temp_pitch = (((rect->w * SDL_BYTESPERPIXEL(native->format)) + 3) & ~3);
        temp_pixels = SDL_malloc(rect->h * temp_pitch);
        if (!temp_pixels) {
            return SDL_OutOfMemory();
        const int temp_pitch = (((rect->w * SDL_BYTESPERPIXEL(native->format)) + 3) & ~3);
        const size_t alloclen = rect->h * temp_pitch;
        if (alloclen > 0) {
            void *temp_pixels = SDL_malloc(alloclen);
            if (!temp_pixels) {
                return SDL_OutOfMemory();
            }
            SDL_SW_CopyYUVToRGB(texture->yuv, rect, native->format,
                                rect->w, rect->h, temp_pixels, temp_pitch);
            SDL_UpdateTexture(native, rect, temp_pixels, temp_pitch);
            SDL_free(temp_pixels);
        }
        SDL_SW_CopyYUVToRGB(texture->yuv, rect, native->format,
                            rect->w, rect->h, temp_pixels, temp_pitch);
        SDL_UpdateTexture(native, rect, temp_pixels, temp_pitch);
        SDL_free(temp_pixels);
    }
    return 0;
}
@@ -900,18 +1067,22 @@
        rect = &full_rect;
    }

    if (!rect->w || !rect->h) {
        return 0;  /* nothing to do. */
    }

    if (texture->yuv) {
        return SDL_UpdateTextureYUVPlanar(texture, rect, Yplane, Ypitch, Uplane, Upitch, Vplane, Vpitch);
    } else {
        SDL_assert(!texture->native);
        renderer = texture->renderer;
        SDL_assert(renderer->UpdateTextureYUV);
      if (renderer->UpdateTextureYUV) {
         return renderer->UpdateTextureYUV(renderer, texture, rect, Yplane, Ypitch, Uplane, Upitch, Vplane, Vpitch);
      } else {
         return SDL_Unsupported();
      }
   }
        if (renderer->UpdateTextureYUV) {
            return renderer->UpdateTextureYUV(renderer, texture, rect, Yplane, Ypitch, Uplane, Upitch, Vplane, Vpitch);
        } else {
            return SDL_Unsupported();
        }
    }
}

static int
@@ -968,8 +1139,8 @@
SDL_UnlockTextureYUV(SDL_Texture * texture)
{
    SDL_Texture *native = texture->native;
    void *native_pixels;
    int native_pitch;
    void *native_pixels = NULL;
    int native_pitch = 0;
    SDL_Rect rect;

    rect.x = 0;
@@ -989,8 +1160,8 @@
SDL_UnlockTextureNative(SDL_Texture * texture)
{
    SDL_Texture *native = texture->native;
    void *native_pixels;
    int native_pitch;
    void *native_pixels = NULL;
    int native_pitch = 0;
    const SDL_Rect *rect = &texture->locked_rect;
    const void* pixels = (void *) ((Uint8 *) texture->pixels +
                        rect->y * texture->pitch +
@@ -1061,10 +1232,13 @@
        }
    }

    SDL_LockMutex(renderer->target_mutex);

    if (texture && !renderer->target) {
        /* Make a backup of the viewport */
        renderer->viewport_backup = renderer->viewport;
        renderer->clip_rect_backup = renderer->clip_rect;
        renderer->clipping_enabled_backup = renderer->clipping_enabled;
        renderer->scale_backup = renderer->scale;
        renderer->logical_w_backup = renderer->logical_w;
        renderer->logical_h_backup = renderer->logical_h;
@@ -1072,6 +1246,7 @@
    renderer->target = texture;

    if (renderer->SetRenderTarget(renderer, texture) < 0) {
        SDL_UnlockMutex(renderer->target_mutex);
        return -1;
    }

@@ -1080,6 +1255,8 @@
        renderer->viewport.y = 0;
        renderer->viewport.w = texture->w;
        renderer->viewport.h = texture->h;
        SDL_zero(renderer->clip_rect);
        renderer->clipping_enabled = SDL_FALSE;
        renderer->scale.x = 1.0f;
        renderer->scale.y = 1.0f;
        renderer->logical_w = texture->w;
@@ -1087,10 +1264,14 @@
    } else {
        renderer->viewport = renderer->viewport_backup;
        renderer->clip_rect = renderer->clip_rect_backup;
        renderer->clipping_enabled = renderer->clipping_enabled_backup;
        renderer->scale = renderer->scale_backup;
        renderer->logical_w = renderer->logical_w_backup;
        renderer->logical_h = renderer->logical_h_backup;
    }

    SDL_UnlockMutex(renderer->target_mutex);

    if (renderer->UpdateViewport(renderer) < 0) {
        return -1;
    }
@@ -1111,14 +1292,38 @@
static int
UpdateLogicalSize(SDL_Renderer *renderer)
{
    int w, h;
    int w = 1, h = 1;
    float want_aspect;
    float real_aspect;
    float scale;
    SDL_Rect viewport;
    /* 0 is for letterbox, 1 is for overscan */
    int scale_policy = 0;
    const char *hint;

    if (!renderer->logical_w || !renderer->logical_h) {
        return 0;
    }
    if (SDL_GetRendererOutputSize(renderer, &w, &h) < 0) {
        return -1;
    }

    hint = SDL_GetHint(SDL_HINT_RENDER_LOGICAL_SIZE_MODE);
    if (hint && (*hint == '1' || SDL_strcasecmp(hint, "overscan") == 0))  {
#if SDL_VIDEO_RENDER_D3D
        SDL_bool overscan_supported = SDL_TRUE;
        /* Unfortunately, Direct3D 9 doesn't support negative viewport numbers
           which the overscan implementation relies on.
        */
        if (SDL_strcasecmp(SDL_GetCurrentVideoDriver(), "direct3d") == 0) {
            overscan_supported = SDL_FALSE;
        }
        if (overscan_supported) {
            scale_policy = 1;
        }
#else
        scale_policy = 1;
#endif
    }

    want_aspect = (float)renderer->logical_w / renderer->logical_h;
@@ -1127,26 +1332,64 @@
    /* Clear the scale because we're setting viewport in output coordinates */
    SDL_RenderSetScale(renderer, 1.0f, 1.0f);

    if (SDL_fabs(want_aspect-real_aspect) < 0.0001) {
    if (renderer->integer_scale) {
        if (want_aspect > real_aspect) {
            scale = (float)(w / renderer->logical_w);
        } else {
            scale = (float)(h / renderer->logical_h);
        }
        viewport.w = (int)SDL_ceil(renderer->logical_w * scale);
        viewport.x = (w - viewport.w) / 2;
        viewport.h = (int)SDL_ceil(renderer->logical_h * scale);
        viewport.y = (h - viewport.h) / 2;

        SDL_RenderSetViewport(renderer, &viewport);
    } else if (SDL_fabs(want_aspect-real_aspect) < 0.0001) {
        /* The aspect ratios are the same, just scale appropriately */
        scale = (float)w / renderer->logical_w;
        SDL_RenderSetViewport(renderer, NULL);
    } else if (want_aspect > real_aspect) {
        /* We want a wider aspect ratio than is available - letterbox it */
        scale = (float)w / renderer->logical_w;
        viewport.x = 0;
        viewport.w = w;
        viewport.h = (int)SDL_ceil(renderer->logical_h * scale);
        viewport.y = (h - viewport.h) / 2;
        SDL_RenderSetViewport(renderer, &viewport);
        if (scale_policy == 1) {
            /* We want a wider aspect ratio than is available - 
             zoom so logical height matches the real height 
             and the width will grow off the screen 
             */
            scale = (float)h / renderer->logical_h;
            viewport.y = 0;
            viewport.h = h;
            viewport.w = (int)SDL_ceil(renderer->logical_w * scale);
            viewport.x = (w - viewport.w) / 2;
            SDL_RenderSetViewport(renderer, &viewport);
        } else {
            /* We want a wider aspect ratio than is available - letterbox it */
            scale = (float)w / renderer->logical_w;
            viewport.x = 0;
            viewport.w = w;
            viewport.h = (int)SDL_ceil(renderer->logical_h * scale);
            viewport.y = (h - viewport.h) / 2;
            SDL_RenderSetViewport(renderer, &viewport);
        }
    } else {
        /* We want a narrower aspect ratio than is available - use side-bars */
        scale = (float)h / renderer->logical_h;
        viewport.y = 0;
        viewport.h = h;
        viewport.w = (int)SDL_ceil(renderer->logical_w * scale);
        viewport.x = (w - viewport.w) / 2;
        SDL_RenderSetViewport(renderer, &viewport);
        if (scale_policy == 1) {
            /* We want a narrower aspect ratio than is available -
             zoom so logical width matches the real width
             and the height will grow off the screen
             */
            scale = (float)w / renderer->logical_w;
            viewport.x = 0;
            viewport.w = w;
            viewport.h = (int)SDL_ceil(renderer->logical_h * scale);
            viewport.y = (h - viewport.h) / 2;
            SDL_RenderSetViewport(renderer, &viewport);
        } else {
            /* We want a narrower aspect ratio than is available - use side-bars */
             scale = (float)h / renderer->logical_h;
             viewport.y = 0;
             viewport.h = h;
             viewport.w = (int)SDL_ceil(renderer->logical_w * scale);
             viewport.x = (w - viewport.w) / 2;
             SDL_RenderSetViewport(renderer, &viewport);
        }
    }

    /* Set the new scale */
@@ -1189,6 +1432,24 @@
}

int
SDL_RenderSetIntegerScale(SDL_Renderer * renderer, SDL_bool enable)
{
    CHECK_RENDERER_MAGIC(renderer, -1);

    renderer->integer_scale = enable;

    return UpdateLogicalSize(renderer);
}

SDL_bool
SDLCALL SDL_RenderGetIntegerScale(SDL_Renderer * renderer)
{
    CHECK_RENDERER_MAGIC(renderer, SDL_FALSE);

    return renderer->integer_scale;
}

int
SDL_RenderSetViewport(SDL_Renderer * renderer, const SDL_Rect * rect)
{
    CHECK_RENDERER_MAGIC(renderer, -1);
@@ -1227,11 +1488,13 @@
    CHECK_RENDERER_MAGIC(renderer, -1)

    if (rect) {
        renderer->clipping_enabled = SDL_TRUE;
        renderer->clip_rect.x = (int)SDL_floor(rect->x * renderer->scale.x);
        renderer->clip_rect.y = (int)SDL_floor(rect->y * renderer->scale.y);
        renderer->clip_rect.w = (int)SDL_ceil(rect->w * renderer->scale.x);
        renderer->clip_rect.h = (int)SDL_ceil(rect->h * renderer->scale.y);
    } else {
        renderer->clipping_enabled = SDL_FALSE;
        SDL_zero(renderer->clip_rect);
    }
    return renderer->UpdateClipRect(renderer);
@@ -1248,6 +1511,13 @@
        rect->w = (int)(renderer->clip_rect.w / renderer->scale.x);
        rect->h = (int)(renderer->clip_rect.h / renderer->scale.y);
    }
}

SDL_bool
SDL_RenderIsClipEnabled(SDL_Renderer * renderer)
{
    CHECK_RENDERER_MAGIC(renderer, SDL_FALSE)
    return renderer->clipping_enabled;
}

int
@@ -1312,6 +1582,9 @@
{
    CHECK_RENDERER_MAGIC(renderer, -1);

    if (!IsSupportedBlendMode(renderer, blendMode)) {
        return SDL_Unsupported();
    }
    renderer->blendMode = blendMode;
    return 0;
}
@@ -1389,6 +1662,7 @@
    if (count < 1) {
        return 0;
    }

    /* Don't draw while we're hidden */
    if (renderer->hidden) {
        return 0;
@@ -1498,6 +1772,7 @@
    if (count < 2) {
        return 0;
    }

    /* Don't draw while we're hidden */
    if (renderer->hidden) {
        return 0;
@@ -1571,6 +1846,7 @@
    if (renderer->hidden) {
        return 0;
    }

    for (i = 0; i < count; ++i) {
        if (SDL_RenderDrawRect(renderer, &rects[i]) < 0) {
            return -1;
@@ -1612,6 +1888,7 @@
    if (count < 1) {
        return 0;
    }

    /* Don't draw while we're hidden */
    if (renderer->hidden) {
        return 0;
@@ -1650,6 +1927,11 @@
        return SDL_SetError("Texture was not created with this renderer");
    }

    /* Don't draw while we're hidden */
    if (renderer->hidden) {
        return 0;
    }

    real_srcrect.x = 0;
    real_srcrect.y = 0;
    real_srcrect.w = texture->w;
@@ -1674,11 +1956,6 @@
        texture = texture->native;
    }

    /* Don't draw while we're hidden */
    if (renderer->hidden) {
        return 0;
    }

    frect.x = real_dstrect.x * renderer->scale.x;
    frect.y = real_dstrect.y * renderer->scale.y;
    frect.w = real_dstrect.w * renderer->scale.x;
@@ -1699,6 +1976,10 @@
    SDL_FRect frect;
    SDL_FPoint fcenter;

    if (flip == SDL_FLIP_NONE && (int)(angle/360) == angle/360) { /* fast path when we don't need rotation or flipping */
        return SDL_RenderCopy(renderer, texture, srcrect, dstrect);
    }

    CHECK_RENDERER_MAGIC(renderer, -1);
    CHECK_TEXTURE_MAGIC(texture, -1);

@@ -1707,6 +1988,11 @@
    }
    if (!renderer->RenderCopyEx) {
        return SDL_SetError("Renderer does not support RenderCopyEx");
    }

    /* Don't draw while we're hidden */
    if (renderer->hidden) {
        return 0;
    }

    real_srcrect.x = 0;
@@ -1732,8 +2018,9 @@
        texture = texture->native;
    }

    if(center) real_center = *center;
    else {
    if (center) {
        real_center = *center;
    } else {
        real_center.x = real_dstrect.w/2;
        real_center.y = real_dstrect.h/2;
    }
@@ -1842,7 +2129,9 @@

    /* Free existing textures for this renderer */
    while (renderer->textures) {
        SDL_Texture *tex = renderer->textures; (void) tex;
        SDL_DestroyTexture(renderer->textures);
        SDL_assert(tex != renderer->textures);  /* satisfy static analysis. */
    }

    if (renderer->window) {
@@ -1851,6 +2140,10 @@

    /* It's no longer magical... */
    renderer->magic = NULL;

    /* Free the target mutex */
    SDL_DestroyMutex(renderer->target_mutex);
    renderer->target_mutex = NULL;

    /* Free the renderer instance */
    renderer->DestroyRenderer(renderer);
@@ -1877,11 +2170,124 @@

    CHECK_TEXTURE_MAGIC(texture, -1);
    renderer = texture->renderer;
    if (renderer && renderer->GL_UnbindTexture) {
    if (texture->native) {
        return SDL_GL_UnbindTexture(texture->native);
    } else if (renderer && renderer->GL_UnbindTexture) {
        return renderer->GL_UnbindTexture(renderer, texture);
    }

    return SDL_Unsupported();
}

void *
SDL_RenderGetMetalLayer(SDL_Renderer * renderer)
{
    CHECK_RENDERER_MAGIC(renderer, NULL);

    if (renderer->GetMetalLayer) {
        return renderer->GetMetalLayer(renderer);
    }
    return NULL;
}

void *
SDL_RenderGetMetalCommandEncoder(SDL_Renderer * renderer)
{
    CHECK_RENDERER_MAGIC(renderer, NULL);

    if (renderer->GetMetalCommandEncoder) {
        return renderer->GetMetalCommandEncoder(renderer);
    }
    return NULL;
}

static SDL_BlendMode
SDL_GetShortBlendMode(SDL_BlendMode blendMode)
{
    if (blendMode == SDL_BLENDMODE_NONE_FULL) {
        return SDL_BLENDMODE_NONE;
    }
    if (blendMode == SDL_BLENDMODE_BLEND_FULL) {
        return SDL_BLENDMODE_BLEND;
    }
    if (blendMode == SDL_BLENDMODE_ADD_FULL) {
        return SDL_BLENDMODE_ADD;
    }
    if (blendMode == SDL_BLENDMODE_MOD_FULL) {
        return SDL_BLENDMODE_MOD;
    }
    return blendMode;
}

static SDL_BlendMode
SDL_GetLongBlendMode(SDL_BlendMode blendMode)
{
    if (blendMode == SDL_BLENDMODE_NONE) {
        return SDL_BLENDMODE_NONE_FULL;
    }
    if (blendMode == SDL_BLENDMODE_BLEND) {
        return SDL_BLENDMODE_BLEND_FULL;
    }
    if (blendMode == SDL_BLENDMODE_ADD) {
        return SDL_BLENDMODE_ADD_FULL;
    }
    if (blendMode == SDL_BLENDMODE_MOD) {
        return SDL_BLENDMODE_MOD_FULL;
    }
    return blendMode;
}

SDL_BlendMode
SDL_ComposeCustomBlendMode(SDL_BlendFactor srcColorFactor, SDL_BlendFactor dstColorFactor,
                           SDL_BlendOperation colorOperation,
                           SDL_BlendFactor srcAlphaFactor, SDL_BlendFactor dstAlphaFactor,
                           SDL_BlendOperation alphaOperation)
{
    SDL_BlendMode blendMode = SDL_COMPOSE_BLENDMODE(srcColorFactor, dstColorFactor, colorOperation,
                                                    srcAlphaFactor, dstAlphaFactor, alphaOperation);
    return SDL_GetShortBlendMode(blendMode);
}

SDL_BlendFactor
SDL_GetBlendModeSrcColorFactor(SDL_BlendMode blendMode)
{
    blendMode = SDL_GetLongBlendMode(blendMode);
    return (SDL_BlendFactor)(((Uint32)blendMode >> 4) & 0xF);
}

SDL_BlendFactor
SDL_GetBlendModeDstColorFactor(SDL_BlendMode blendMode)
{
    blendMode = SDL_GetLongBlendMode(blendMode);
    return (SDL_BlendFactor)(((Uint32)blendMode >> 8) & 0xF);
}

SDL_BlendOperation
SDL_GetBlendModeColorOperation(SDL_BlendMode blendMode)
{
    blendMode = SDL_GetLongBlendMode(blendMode);
    return (SDL_BlendOperation)(((Uint32)blendMode >> 0) & 0xF);
}

SDL_BlendFactor
SDL_GetBlendModeSrcAlphaFactor(SDL_BlendMode blendMode)
{
    blendMode = SDL_GetLongBlendMode(blendMode);
    return (SDL_BlendFactor)(((Uint32)blendMode >> 20) & 0xF);
}

SDL_BlendFactor
SDL_GetBlendModeDstAlphaFactor(SDL_BlendMode blendMode)
{
    blendMode = SDL_GetLongBlendMode(blendMode);
    return (SDL_BlendFactor)(((Uint32)blendMode >> 24) & 0xF);
}

SDL_BlendOperation
SDL_GetBlendModeAlphaOperation(SDL_BlendMode blendMode)
{
    blendMode = SDL_GetLongBlendMode(blendMode);
    return (SDL_BlendOperation)(((Uint32)blendMode >> 16) & 0xF);
}

/* vi: set ts=4 sw=4 expandtab: */