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(RGUI) Add automatic downscaling of large thumbnails

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This commit is contained in:
jdgleaver 2019-01-22 15:00:45 +00:00
parent 10e50bb806
commit 9d0e9632c1
1 changed files with 75 additions and 26 deletions
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101
menu/drivers/rgui.c
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@ -589,11 +589,64 @@ static void request_thumbnail(rgui_t *rgui, const char *path)
}
}
static void process_thumbnail(rgui_t *rgui, struct texture_image *image)
static bool downscale_thumbnail(struct texture_image *image_src, struct texture_image *image_dst)
{
uint32_t x_ratio, y_ratio;
unsigned x_src, y_src;
unsigned x_dst, y_dst;
static const float display_aspect_ratio = (float)THUMB_MAX_WIDTH / (float)THUMB_MAX_HEIGHT;
/* Determine output dimensions */
float aspect_ratio = (float)image_src->width / (float)image_src->height;
if (aspect_ratio > display_aspect_ratio)
{
image_dst->width = THUMB_MAX_WIDTH;
image_dst->height = image_src->height * THUMB_MAX_WIDTH / image_src->width;
/* Account for any possible rounding errors... */
image_dst->height = (image_dst->height < 1) ? 1 : image_dst->height;
image_dst->height = (image_dst->height > THUMB_MAX_HEIGHT) ? THUMB_MAX_HEIGHT : image_dst->height;
}
else
{
image_dst->height = THUMB_MAX_HEIGHT;
image_dst->width = image_src->width * THUMB_MAX_HEIGHT / image_src->height;
/* Account for any possible rounding errors... */
image_dst->width = (image_dst->width < 1) ? 1 : image_dst->width;
image_dst->width = (image_dst->width > THUMB_MAX_WIDTH) ? THUMB_MAX_WIDTH : image_dst->width;
}
/* Allocate pixel buffer */
image_dst->pixels = (uint32_t*)calloc(image_dst->width * image_dst->height, sizeof(uint32_t));
if (!image_dst->pixels)
return false;
/* Perform nearest neighbour resampling */
x_ratio = ((image_src->width << 16) / image_dst->width);
y_ratio = ((image_src->height << 16) / image_dst->height);
for (y_dst = 0; y_dst < image_dst->height; y_dst++)
{
y_src = (y_dst * y_ratio) >> 16;
for (x_dst = 0; x_dst < image_dst->width; x_dst++)
{
x_src = (x_dst * x_ratio) >> 16;
image_dst->pixels[(y_dst * image_dst->width) + x_dst] = image_src->pixels[(y_src * image_src->width) + x_src];
}
}
return true;
}
static void process_thumbnail(rgui_t *rgui, struct texture_image *image_src)
{
unsigned width, height;
unsigned x, y;
unsigned x_offset, y_offset;
struct texture_image *image = NULL;
struct texture_image image_resampled = {
0,
0,
NULL,
false
};
/* Ensure that we only process the most recently loaded
* thumbnail image (i.e. don't waste CPU cycles processing
@ -608,42 +661,32 @@ static void process_thumbnail(rgui_t *rgui, struct texture_image *image)
if (rgui->thumbnail_queue_size > 0)
return;
if (!image->pixels)
/* Sanity check */
if (!image_src->pixels || (image_src->width < 1) || (image_src->height < 1))
return;
width = image->width;
height = image->height;
/* Have to crop image if larger than max allowed size... */
if (width > THUMB_MAX_WIDTH)
/* Downscale thumbnail if it exceeds maximum size limits */
if ((image_src->width > THUMB_MAX_WIDTH) || (image_src->height > THUMB_MAX_HEIGHT))
{
x_offset = (width - THUMB_MAX_WIDTH) >> 1;
thumbnail.width = THUMB_MAX_WIDTH;
if (!downscale_thumbnail(image_src, &image_resampled))
return;
image = &image_resampled;
}
else
{
x_offset = 0;
thumbnail.width = width;
}
if (height > THUMB_MAX_HEIGHT)
{
y_offset = (height - THUMB_MAX_HEIGHT) >> 1;
thumbnail.height = THUMB_MAX_HEIGHT;
}
else
{
y_offset = 0;
thumbnail.height = height;
image = image_src;
}
/* Copy (cropped) image to thumbnail buffer, performing
* pixel format conversion */
thumbnail.width = image->width;
thumbnail.height = image->height;
/* Copy image to thumbnail buffer, performing pixel format conversion */
for (x = 0; x < thumbnail.width; x++)
{
for (y = 0; y < thumbnail.height; y++)
{
thumbnail.data[x + (y * thumbnail.width)] =
argb32_to_pixel_platform_format(image->pixels[(x + x_offset) + ((y + y_offset) * width)]);
argb32_to_pixel_platform_format(image->pixels[x + (y * thumbnail.width)]);
}
}
@ -651,6 +694,12 @@ static void process_thumbnail(rgui_t *rgui, struct texture_image *image)
/* Tell menu that a display update is required */
rgui->force_redraw = true;
/* Clean up */
image = NULL;
if (image_resampled.pixels)
free(image_resampled.pixels);
image_resampled.pixels = NULL;
}
static bool rgui_load_image(void *userdata, void *data, enum menu_image_type type)