diff options
Diffstat (limited to 'frontends/gtk/bitmap.c')
-rw-r--r-- | frontends/gtk/bitmap.c | 278 |
1 files changed, 16 insertions, 262 deletions
diff --git a/frontends/gtk/bitmap.c b/frontends/gtk/bitmap.c index 36b614cf9..a995a9e28 100644 --- a/frontends/gtk/bitmap.c +++ b/frontends/gtk/bitmap.c @@ -45,22 +45,25 @@ * Create a bitmap. * * \param width width of image in pixels - * \param height width of image in pixels - * \param state a flag word indicating the initial state + * \param height height of image in pixels + * \param flags flags for bitmap creation * \return an opaque struct bitmap, or NULL on memory exhaustion */ -static void *bitmap_create(int width, int height, unsigned int state) +static void *bitmap_create(int width, int height, enum gui_bitmap_flags flags) { struct bitmap *gbitmap; + if (width == 0 || height == 0) { + return NULL; + } + gbitmap = calloc(1, sizeof(struct bitmap)); if (gbitmap != NULL) { - if ((state & BITMAP_OPAQUE) != 0) { - gbitmap->surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24, width, height); - } else { - gbitmap->surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height); + if (flags & BITMAP_OPAQUE) { + gbitmap->opaque = true; } + gbitmap->surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height); if (cairo_surface_status(gbitmap->surface) != CAIRO_STATUS_SUCCESS) { cairo_surface_destroy(gbitmap->surface); free(gbitmap); @@ -81,76 +84,8 @@ static void *bitmap_create(int width, int height, unsigned int state) static void bitmap_set_opaque(void *vbitmap, bool opaque) { struct bitmap *gbitmap = (struct bitmap *)vbitmap; - cairo_format_t fmt; - cairo_surface_t *nsurface = NULL; - - assert(gbitmap); - - fmt = cairo_image_surface_get_format(gbitmap->surface); - if (fmt == CAIRO_FORMAT_RGB24) { - if (opaque == false) { - /* opaque to transparent */ - nsurface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, - cairo_image_surface_get_width(gbitmap->surface), - cairo_image_surface_get_height(gbitmap->surface)); - - } - - } else { - if (opaque == true) { - /* transparent to opaque */ - nsurface = cairo_image_surface_create(CAIRO_FORMAT_RGB24, - cairo_image_surface_get_width(gbitmap->surface), - cairo_image_surface_get_height(gbitmap->surface)); - - } - } - - if (nsurface != NULL) { - if (cairo_surface_status(nsurface) != CAIRO_STATUS_SUCCESS) { - cairo_surface_destroy(nsurface); - } else { - memcpy(cairo_image_surface_get_data(nsurface), - cairo_image_surface_get_data(gbitmap->surface), - cairo_image_surface_get_stride(gbitmap->surface) * cairo_image_surface_get_height(gbitmap->surface)); - cairo_surface_destroy(gbitmap->surface); - gbitmap->surface = nsurface; - - cairo_surface_mark_dirty(gbitmap->surface); - - } - - } -} - - -/** - * Tests whether a bitmap has an opaque alpha channel - * - * \param vbitmap a bitmap, as returned by bitmap_create() - * \return whether the bitmap is opaque - */ -static bool bitmap_test_opaque(void *vbitmap) -{ - struct bitmap *gbitmap = (struct bitmap *)vbitmap; - unsigned char *pixels; - int pcount; - int ploop; - - assert(gbitmap); - - pixels = cairo_image_surface_get_data(gbitmap->surface); - - pcount = cairo_image_surface_get_stride(gbitmap->surface) * - cairo_image_surface_get_height(gbitmap->surface); - - for (ploop = 3; ploop < pcount; ploop += 4) { - if (pixels[ploop] != 0xff) { - return false; - } - } - return true; + gbitmap->opaque = opaque; } @@ -162,16 +97,8 @@ static bool bitmap_test_opaque(void *vbitmap) static bool bitmap_get_opaque(void *vbitmap) { struct bitmap *gbitmap = (struct bitmap *)vbitmap; - cairo_format_t fmt; - assert(gbitmap); - - fmt = cairo_image_surface_get_format(gbitmap->surface); - if (fmt == CAIRO_FORMAT_RGB24) { - return true; - } - - return false; + return gbitmap->opaque; } @@ -187,83 +114,13 @@ static bool bitmap_get_opaque(void *vbitmap) static unsigned char *bitmap_get_buffer(void *vbitmap) { struct bitmap *gbitmap = (struct bitmap *)vbitmap; - int pixel_loop; - int pixel_count; uint8_t *pixels; - uint32_t t, r, g, b; - cairo_format_t fmt; assert(gbitmap); cairo_surface_flush(gbitmap->surface); pixels = cairo_image_surface_get_data(gbitmap->surface); - if (!gbitmap->converted) - return pixels; - - fmt = cairo_image_surface_get_format(gbitmap->surface); - pixel_count = cairo_image_surface_get_width(gbitmap->surface) * - cairo_image_surface_get_height(gbitmap->surface); - - if (fmt == CAIRO_FORMAT_RGB24) { - /* Opaque image */ - for (pixel_loop=0; pixel_loop < pixel_count; pixel_loop++) { - /* Cairo surface is ARGB, written in native endian */ -#if G_BYTE_ORDER == G_LITTLE_ENDIAN - b = pixels[4 * pixel_loop + 0]; - g = pixels[4 * pixel_loop + 1]; - r = pixels[4 * pixel_loop + 2]; - t = pixels[4 * pixel_loop + 3]; -#else - t = pixels[4 * pixel_loop + 0]; - r = pixels[4 * pixel_loop + 1]; - g = pixels[4 * pixel_loop + 2]; - b = pixels[4 * pixel_loop + 3]; -#endif - - /* Core bitmaps always have a component order of rgba, - * regardless of system endianness */ - pixels[4 * pixel_loop + 0] = r; - pixels[4 * pixel_loop + 1] = g; - pixels[4 * pixel_loop + 2] = b; - pixels[4 * pixel_loop + 3] = t; - } - } else { - /* Alpha image: de-multiply alpha */ - for (pixel_loop=0; pixel_loop < pixel_count; pixel_loop++) { -#if G_BYTE_ORDER == G_LITTLE_ENDIAN - b = pixels[4 * pixel_loop + 0]; - g = pixels[4 * pixel_loop + 1]; - r = pixels[4 * pixel_loop + 2]; - t = pixels[4 * pixel_loop + 3]; -#else - t = pixels[4 * pixel_loop + 0]; - r = pixels[4 * pixel_loop + 1]; - g = pixels[4 * pixel_loop + 2]; - b = pixels[4 * pixel_loop + 3]; -#endif - - if (t != 0) { - r = (r << 8) / t; - g = (g << 8) / t; - b = (b << 8) / t; - - r = (r > 255) ? 255 : r; - g = (g > 255) ? 255 : g; - b = (b > 255) ? 255 : b; - } else { - r = g = b = 0; - } - - pixels[4 * pixel_loop + 0] = r; - pixels[4 * pixel_loop + 1] = g; - pixels[4 * pixel_loop + 2] = b; - pixels[4 * pixel_loop + 3] = t; - } - } - - gbitmap->converted = false; - return (unsigned char *) pixels; } @@ -284,22 +141,6 @@ static size_t bitmap_get_rowstride(void *vbitmap) /** - * Find the bytes per pixel of a bitmap - * - * \param vbitmap a bitmap, as returned by bitmap_create() - * \return bytes per pixel - */ -static size_t bitmap_get_bpp(void *vbitmap) -{ - struct bitmap *gbitmap = (struct bitmap *)vbitmap; - assert(gbitmap); - - return 4; -} - - - -/** * Free a bitmap. * * \param vbitmap a bitmap, as returned by bitmap_create() @@ -320,23 +161,6 @@ static void bitmap_destroy(void *vbitmap) /** - * Save a bitmap in the platform's native format. - * - * \param vbitmap a bitmap, as returned by bitmap_create() - * \param path pathname for file - * \param flags modify the behaviour of the save - * \return true on success, false on error and error reported - */ -static bool bitmap_save(void *vbitmap, const char *path, unsigned flags) -{ - struct bitmap *gbitmap = (struct bitmap *)vbitmap; - assert(gbitmap); - - return false; -} - - -/** * The bitmap image has changed, so flush any persistant cache. * * \param vbitmap a bitmap, as returned by bitmap_create() @@ -344,81 +168,10 @@ static bool bitmap_save(void *vbitmap, const char *path, unsigned flags) static void bitmap_modified(void *vbitmap) { struct bitmap *gbitmap = (struct bitmap *)vbitmap; - int pixel_loop; - int pixel_count; - uint8_t *pixels; - uint32_t t, r, g, b; - cairo_format_t fmt; assert(gbitmap); - fmt = cairo_image_surface_get_format(gbitmap->surface); - - pixel_count = cairo_image_surface_get_width(gbitmap->surface) * - cairo_image_surface_get_height(gbitmap->surface); - pixels = cairo_image_surface_get_data(gbitmap->surface); - - if (gbitmap->converted) { - cairo_surface_mark_dirty(gbitmap->surface); - return; - } - - if (fmt == CAIRO_FORMAT_RGB24) { - /* Opaque image */ - for (pixel_loop=0; pixel_loop < pixel_count; pixel_loop++) { - /* Core bitmaps always have a component order of rgba, - * regardless of system endianness */ - r = pixels[4 * pixel_loop + 0]; - g = pixels[4 * pixel_loop + 1]; - b = pixels[4 * pixel_loop + 2]; - t = pixels[4 * pixel_loop + 3]; - - /* Cairo surface is ARGB, written in native endian */ -#if G_BYTE_ORDER == G_LITTLE_ENDIAN - pixels[4 * pixel_loop + 0] = b; - pixels[4 * pixel_loop + 1] = g; - pixels[4 * pixel_loop + 2] = r; - pixels[4 * pixel_loop + 3] = t; -#else - pixels[4 * pixel_loop + 0] = t; - pixels[4 * pixel_loop + 1] = r; - pixels[4 * pixel_loop + 2] = g; - pixels[4 * pixel_loop + 3] = b; -#endif - } - } else { - /* Alpha image: pre-multiply alpha */ - for (pixel_loop=0; pixel_loop < pixel_count; pixel_loop++) { - r = pixels[4 * pixel_loop + 0]; - g = pixels[4 * pixel_loop + 1]; - b = pixels[4 * pixel_loop + 2]; - t = pixels[4 * pixel_loop + 3]; - - if (t != 0) { - r = ((r * (t + 1)) >> 8) & 0xff; - g = ((g * (t + 1)) >> 8) & 0xff; - b = ((b * (t + 1)) >> 8) & 0xff; - } else { - r = g = b = 0; - } - -#if G_BYTE_ORDER == G_LITTLE_ENDIAN - pixels[4 * pixel_loop + 0] = b; - pixels[4 * pixel_loop + 1] = g; - pixels[4 * pixel_loop + 2] = r; - pixels[4 * pixel_loop + 3] = t; -#else - pixels[4 * pixel_loop + 0] = t; - pixels[4 * pixel_loop + 1] = r; - pixels[4 * pixel_loop + 2] = g; - pixels[4 * pixel_loop + 3] = b; -#endif - } - } - cairo_surface_mark_dirty(gbitmap->surface); - - gbitmap->converted = true; } /* exported interface documented in gtk/bitmap.h */ @@ -478,6 +231,10 @@ bitmap_render(struct bitmap *bitmap, struct hlcache_handle *content) * aspect ratio of the required thumbnail. */ cheight = ((cwidth * dheight) + (dwidth / 2)) / dwidth; + /* At this point, we MUST have decided to render something non-zero sized */ + assert(cwidth > 0); + assert(cheight > 0); + /* Create surface to render into */ surface = cairo_surface_create_similar(dsurface, CAIRO_CONTENT_COLOR_ALPHA, cwidth, cheight); @@ -526,13 +283,10 @@ static struct gui_bitmap_table bitmap_table = { .destroy = bitmap_destroy, .set_opaque = bitmap_set_opaque, .get_opaque = bitmap_get_opaque, - .test_opaque = bitmap_test_opaque, .get_buffer = bitmap_get_buffer, .get_rowstride = bitmap_get_rowstride, .get_width = nsgtk_bitmap_get_width, .get_height = nsgtk_bitmap_get_height, - .get_bpp = bitmap_get_bpp, - .save = bitmap_save, .modified = bitmap_modified, .render = bitmap_render, }; |