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9b71307d49
This patch also adds a Format concept to GraphicsBitmap. For now there are only two formats: RGB32 and RGBA32. Windows with alpha channel have their backing stores created in the RGBA32 format. Use this to make Terminal windows semi-transparent for that comfy rice look. There is one problem here, in that window compositing overdraw incurs multiple passes of blending of the same pixels. This leads to a mismatch in opacity which is obviously not good. I will work on this in a later patch. The alpha blending is currently straight C++. It should be relatively easy to optimize this using SSE instructions. For now I'm just happy with the cute effect. :^)
93 lines
2.7 KiB
C++
93 lines
2.7 KiB
C++
#include "GraphicsBitmap.h"
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#include <sys/mman.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <stdio.h>
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RetainPtr<GraphicsBitmap> GraphicsBitmap::create(Format format, const Size& size)
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{
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return adopt(*new GraphicsBitmap(format, size));
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}
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GraphicsBitmap::GraphicsBitmap(Format format, const Size& size)
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: m_size(size)
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, m_pitch(size.width() * sizeof(RGBA32))
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, m_format(format)
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{
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size_t size_in_bytes = size.area() * sizeof(RGBA32);
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m_data = (RGBA32*)mmap(nullptr, size_in_bytes, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
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ASSERT(m_data && m_data != (void*)-1);
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set_mmap_name(m_data, size_in_bytes, String::format("GraphicsBitmap [%dx%d]", width(), height()).characters());
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m_mmaped = true;
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}
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RetainPtr<GraphicsBitmap> GraphicsBitmap::create_wrapper(Format format, const Size& size, RGBA32* data)
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{
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return adopt(*new GraphicsBitmap(format, size, data));
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}
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RetainPtr<GraphicsBitmap> GraphicsBitmap::load_from_file(Format format, const String& path, const Size& size)
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{
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int fd = open(path.characters(), O_RDONLY, 0644);
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if (fd < 0) {
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dbgprintf("open(%s) got fd=%d, failed: %s\n", path.characters(), fd, strerror(errno));
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perror("open");
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return nullptr;
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}
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auto* mapped_data = (RGBA32*)mmap(nullptr, size.area() * 4, PROT_READ, MAP_SHARED, fd, 0);
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if (mapped_data == MAP_FAILED) {
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int rc = close(fd);
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ASSERT(rc == 0);
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return nullptr;
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}
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int rc = close(fd);
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ASSERT(rc == 0);
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auto bitmap = create_wrapper(format, size, mapped_data);
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bitmap->m_mmaped = true;
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return bitmap;
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}
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GraphicsBitmap::GraphicsBitmap(Format format, const Size& size, RGBA32* data)
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: m_size(size)
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, m_data(data)
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, m_pitch(size.width() * sizeof(RGBA32))
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, m_format(format)
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{
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}
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RetainPtr<GraphicsBitmap> GraphicsBitmap::create_with_shared_buffer(Format format, int shared_buffer_id, const Size& size, RGBA32* data)
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{
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if (!data) {
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void* shared_buffer = get_shared_buffer(shared_buffer_id);
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if (!shared_buffer || shared_buffer == (void*)-1)
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return nullptr;
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data = (RGBA32*)shared_buffer;
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}
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return adopt(*new GraphicsBitmap(format, shared_buffer_id, size, data));
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}
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GraphicsBitmap::GraphicsBitmap(Format format, int shared_buffer_id, const Size& size, RGBA32* data)
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: m_size(size)
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, m_data(data)
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, m_pitch(size.width() * sizeof(RGBA32))
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, m_format(format)
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, m_shared_buffer_id(shared_buffer_id)
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{
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}
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GraphicsBitmap::~GraphicsBitmap()
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{
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if (m_mmaped) {
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int rc = munmap(m_data, m_size.area() * 4);
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ASSERT(rc == 0);
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}
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if (m_shared_buffer_id != -1) {
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int rc = release_shared_buffer(m_shared_buffer_id);
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ASSERT(rc == 0);
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}
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m_data = nullptr;
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}
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