Henrik Hautakoski
c731cda1a2
source/Graphics/Image/IcoFormat.cpp: use new PixelFormat. source/Graphics/Image.cpp: update to confirm with new PixelFormat Spectre/Graphics/PixelFormat: add PF_getNumChannels() Spectre/Graphics/PixelFormat: Rework the enum with proper naming convention and documentation.
76 lines
1.6 KiB
C++
76 lines
1.6 KiB
C++
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#include "IcoFormat.h"
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#include <Spectre/System/ByteOrder.h>
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#include <Spectre/Graphics/Image.h>
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#include <Spectre/System/Log.h>
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#include "Format/ico.h"
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namespace sp {
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namespace image {
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ICONDIRENTRY* findLargestImage(ICONDIRENTRY *ent, uint16_t size) {
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uint32_t idx = 0, lgsz = 0, sz;
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for (int i = 0; i < size; i++) {
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sz = ent[i].width * ent[i].height;
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if (sz > lgsz) {
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lgsz = sz;
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idx = i;
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}
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}
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return ent + idx;
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}
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bool IcoFormat::decode(Image& img, const unsigned char *data, unsigned size)
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{
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uint8_t *pixels;
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PixelFormat format;
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ICONDIRENTRY *ent;
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ICONDIRENTRY *largest;
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uint16_t type;
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uint16_t num_ent;
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type = system::ltoh16(data + 2);
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num_ent = system::ltoh16(data + 4);
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// Type: 1 = ICO, 2 = CUR
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if (type != 0x0001 || num_ent < 1) {
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return false;
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}
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// Allocate ICONDIRENT for all images in the file.
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ent = (ICONDIRENTRY *) malloc(sizeof(ICONDIRENTRY) * num_ent);
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if (!ent) {
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return false;
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}
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for (int i = 0; i < num_ent; i++) {
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unsigned int p = 6 + (i * ICONDIRENTRY_SIZE);
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ent[i].width = data[p + 0];
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ent[i].height = data[p + 1];
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ent[i].num_colors = data[p + 2];
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ent[i].color_planes = data[p + 4];
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ent[i].bpp = data[p + 6];
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ent[i].size = system::ltoh32(data + p + 8);
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ent[i].offset = system::ltoh32(data + p + 12);
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}
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// Find Largest image
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largest = findLargestImage(ent, num_ent);
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if (largest->bpp == 32) {
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format = PixelFormat::PF_BGRA;
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} else {
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format = PixelFormat::PF_BGR;
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}
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// NOTE: plus 40 bytes here to skip over the DIB header.
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img.create(largest->width, largest->height, data + largest->offset + 40, format);
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free(ent);
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return true;
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}
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}} // namespace sp::image
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